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Overview
Comment:For traces and embedding support, select modernizations from Patrick Fradin.
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SHA1: d36209124c15bd0997e424c8c99e01a71e05766a
User & Date: dgp 2013-01-31 04:34:11
Context
2013-01-31
10:31
merge core-8-5-branch check-in: f9be79d941 user: jan.nijtmans tags: trunk
05:17
merge trunk Leaf check-in: 6ea5f2ccf9 user: dgp tags: contrib-patrick-fradin-code-cleanup
04:34
For traces and embedding support, select modernizations from Patrick Fradin. check-in: d36209124c user: dgp tags: trunk
04:29
For embedding support, select modernizations from Patrick Fradin check-in: ee70052c43 user: dgp tags: core-8-5-branch
04:07
Better testevent cleanup and event loop management check-in: f28e0cda05 user: dgp tags: trunk
Changes
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Changes to tests/main.test.

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	Tcl_Main: startup script - -encoding option
    } -constraints {
	stdio
    } -setup {
	set script [makeFile {} script]
	file delete $script
	set f [open $script w]
	fconfigure $f -encoding utf-8
	puts $f {puts [list $argv0 $argv $tcl_interactive]}
	puts -nonewline $f {puts [string equal \u20ac }
	puts $f "\u20ac]"
	close $f
	catch {set f [open "|[list [interpreter] -encoding utf-8 script]" r]}
    } -body {
	read $f
    } -cleanup {
	close $f
	removeFile script
    } -result [list script {} 0]\n1\n

    test Tcl_Main-1.8 {
	Tcl_Main: startup script - -encoding option - mismatched encodings
    } -constraints {
	stdio
    } -setup {
	set script [makeFile {} script]
	file delete $script
	set f [open $script w]
	fconfigure $f -encoding utf-8
	puts $f {puts [list $argv0 $argv $tcl_interactive]}
	puts -nonewline $f {puts [string equal \u20ac }
	puts $f "\u20ac]"
	close $f
	catch {set f [open "|[list [interpreter] -encoding ascii script]" r]}
    } -body {
	read $f
    } -cleanup {
	close $f
	removeFile script
    } -result [list script {} 0]\n0\n

    test Tcl_Main-1.9 {
	Tcl_Main: startup script - -encoding option - no abbrevation
    } -constraints {
	stdio
    } -setup {
	set script [makeFile {} script]
	file delete $script
	set f [open $script w]
	fconfigure $f -encoding utf-8
	puts $f {puts [list $argv0 $argv $tcl_interactive]}
	puts -nonewline $f {puts [string equal \u20ac }
	puts $f "\u20ac]"
	close $f
	catch {set f [open "|[list [interpreter] -enc utf-8 script]" r+]}
    } -body {
	type $f {








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	Tcl_Main: startup script - -encoding option
    } -constraints {
	stdio
    } -setup {
	set script [makeFile {} script]
	file delete $script
	set f [open $script w]
	chan configure $f -encoding utf-8
	puts $f {puts [list $argv0 $argv $tcl_interactive]}
	puts -nonewline $f {puts [string equal \u20ac }
	puts $f "\u20ac]"
	close $f
	catch {set f [open "|[list [interpreter] -encoding utf-8 script]" r]}
    } -body {
	read $f
    } -cleanup {
	close $f
	removeFile script
    } -result [list script {} 0]\n1\n

    test Tcl_Main-1.8 {
	Tcl_Main: startup script - -encoding option - mismatched encodings
    } -constraints {
	stdio
    } -setup {
	set script [makeFile {} script]
	file delete $script
	set f [open $script w]
	chan configure $f -encoding utf-8
	puts $f {puts [list $argv0 $argv $tcl_interactive]}
	puts -nonewline $f {puts [string equal \u20ac }
	puts $f "\u20ac]"
	close $f
	catch {set f [open "|[list [interpreter] -encoding ascii script]" r]}
    } -body {
	read $f
    } -cleanup {
	close $f
	removeFile script
    } -result [list script {} 0]\n0\n

    test Tcl_Main-1.9 {
	Tcl_Main: startup script - -encoding option - no abbrevation
    } -constraints {
	stdio
    } -setup {
	set script [makeFile {} script]
	file delete $script
	set f [open $script w]
	chan configure $f -encoding utf-8
	puts $f {puts [list $argv0 $argv $tcl_interactive]}
	puts -nonewline $f {puts [string equal \u20ac }
	puts $f "\u20ac]"
	close $f
	catch {set f [open "|[list [interpreter] -enc utf-8 script]" r+]}
    } -body {
	type $f {
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	Tcl_Main able to handle non-blocking stdin
    } -constraints {
	exec
    } -setup {
	catch {set f [open "|[list [interpreter]]" w+]}
    } -body {
	type $f {
	    fconfigure stdin -blocking 0
	    puts SUCCESS
	}
	list [catch {gets $f} line] $line
    } -cleanup {
	close $f
    } -result [list 0 SUCCESS]

    test Tcl_Main-5.3 {
	Tcl_Main handles stdin EOF in mid-command
    } -constraints {
	exec
    } -setup {
	catch {set f [open "|[list [interpreter]]" w+]}
	catch {fconfigure $f -blocking 0}
    } -body {
	type $f "fconfigure stdin -eofchar \\032
	    if 1 \{\n\032"
	variable wait
	fileevent $f readable \
		[list set [namespace which -variable wait] "child exit"]
	set id [after 2000 [list set [namespace which -variable wait] timeout]]
	vwait [namespace which -variable wait]
	after cancel $id
	set wait
    } -cleanup {
	if {[string equal timeout $wait] && [testConstraint unix]} {
	    exec kill [pid $f]
	}
	close $f
    } -result {child exit}

    test Tcl_Main-5.4 {
	Tcl_Main handles stdin EOF in mid-command
    } -constraints {
	exec
    } -setup {
	set cmd {makeFile "if 1 \{" script}
	catch {set f [open "|[list [interpreter]] < [list [eval $cmd]]" r]}
	catch {fconfigure $f -blocking 0}
    } -body {
	variable wait
	fileevent $f readable \
		[list set [namespace which -variable wait] "child exit"]
	set id [after 2000 [list set [namespace which -variable wait] timeout]]
	vwait [namespace which -variable wait]
	after cancel $id
	set wait
    } -cleanup {
	if {[string equal timeout $wait] && [testConstraint unix]} {
	    exec kill [pid $f]
	}
	close $f
	removeFile script
    } -result {child exit}

    test Tcl_Main-5.5 {








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	Tcl_Main able to handle non-blocking stdin
    } -constraints {
	exec
    } -setup {
	catch {set f [open "|[list [interpreter]]" w+]}
    } -body {
	type $f {
	    chan configure stdin -blocking 0
	    puts SUCCESS
	}
	list [catch {gets $f} line] $line
    } -cleanup {
	close $f
    } -result [list 0 SUCCESS]

    test Tcl_Main-5.3 {
	Tcl_Main handles stdin EOF in mid-command
    } -constraints {
	exec
    } -setup {
	catch {set f [open "|[list [interpreter]]" w+]}
	catch {chan configure $f -blocking 0}
    } -body {
	type $f "chan configure stdin -eofchar \\032
	    if 1 \{\n\032"
	variable wait
	chan event $f readable \
		[list set [namespace which -variable wait] "child exit"]
	set id [after 2000 [list set [namespace which -variable wait] timeout]]
	vwait [namespace which -variable wait]
	after cancel $id
	set wait
    } -cleanup {
	if {$wait eq "timeout" && [testConstraint unix]} {
	    exec kill [pid $f]
	}
	close $f
    } -result {child exit}

    test Tcl_Main-5.4 {
	Tcl_Main handles stdin EOF in mid-command
    } -constraints {
	exec
    } -setup {
	set cmd {makeFile "if 1 \{" script}
	catch {set f [open "|[list [interpreter]] < [list [eval $cmd]]" r]}
	catch {chan configure $f -blocking 0}
    } -body {
	variable wait
	chan event $f readable \
		[list set [namespace which -variable wait] "child exit"]
	set id [after 2000 [list set [namespace which -variable wait] timeout]]
	vwait [namespace which -variable wait]
	after cancel $id
	set wait
    } -cleanup {
	if {$wait eq "timeout" && [testConstraint unix]} {
	    exec kill [pid $f]
	}
	close $f
	removeFile script
    } -result {child exit}

    test Tcl_Main-5.5 {
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    test Tcl_Main-5.10 {
	Tcl_Main: exit main loop in mid-interactive command
    } -constraints {
	exec Tcltest
    } -setup {
	catch {set f [open "|[list [interpreter]]" w+]}
	catch {fconfigure $f -blocking 0}
    } -body {
	type $f "testsetmainloop
	         after 2000 testexitmainloop
	         puts \{1 2"
	after 4000
	type $f "3 4\}"
	set code1 [catch {gets $f} line1]








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    test Tcl_Main-5.10 {
	Tcl_Main: exit main loop in mid-interactive command
    } -constraints {
	exec Tcltest
    } -setup {
	catch {set f [open "|[list [interpreter]]" w+]}
	catch {chan configure $f -blocking 0}
    } -body {
	type $f "testsetmainloop
	         after 2000 testexitmainloop
	         puts \{1 2"
	after 4000
	type $f "3 4\}"
	set code1 [catch {gets $f} line1]
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    test Tcl_Main-8.1 {
	StdinProc: handles non-blocking stdin
    } -constraints {
	exec Tcltest
    } -body {
	exec [interpreter] << {
		testsetmainloop
		fconfigure stdin -blocking 0
		testexitmainloop
	} >& result
	set f [open result]
	read $f
    } -cleanup {
	close $f
	file delete result








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    test Tcl_Main-8.1 {
	StdinProc: handles non-blocking stdin
    } -constraints {
	exec Tcltest
    } -body {
	exec [interpreter] << {
		testsetmainloop
		chan configure stdin -blocking 0
		testexitmainloop
	} >& result
	set f [open result]
	read $f
    } -cleanup {
	close $f
	file delete result
︙︙

Changes to tests/trace.test. 

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# Commands covered:  trace
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994 Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.

if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest
    namespace import -force ::tcltest::*
}

::tcltest::loadTestedCommands
catch [list package require -exact Tcltest [info patchlevel]]

testConstraint testcmdtrace [llength [info commands testcmdtrace]]
testConstraint testevalobjv [llength [info commands testevalobjv]]

# Used for constraining memory leak tests
testConstraint memory [llength [info commands memory]]

proc getbytes {} {
    set lines [split [memory info] "\n"]
    lindex [lindex $lines 3] 3
}

proc traceScalar {name1 name2 op} {
    global info
    set info [list $name1 $name2 $op [catch {uplevel set $name1} msg] $msg]
}
proc traceScalarAppend {name1 name2 op} {
    global info
    lappend info $name1 $name2 $op [catch {uplevel set $name1} msg] $msg
}
proc traceArray {name1 name2 op} {
    global info
    set info [list $name1 $name2 $op [catch {uplevel set [set name1]($name2)} msg] $msg]
}
proc traceArray2 {name1 name2 op} {
    global info
    set info [list $name1 $name2 $op]
}
proc traceProc {name1 name2 op} {
    global info














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# Commands covered:  trace
#
# This file contains a collection of tests for one or more of the Tcl
# built-in commands.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994 Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.


package require tcltest
namespace import ::tcltest::*


::tcltest::loadTestedCommands
catch [list package require -exact Tcltest [info patchlevel]]

testConstraint testcmdtrace [llength [info commands testcmdtrace]]
testConstraint testevalobjv [llength [info commands testevalobjv]]

# Used for constraining memory leak tests
testConstraint memory [llength [info commands memory]]

proc getbytes {} {
    set lines [split [memory info] "\n"]
    lindex [lindex $lines 3] 3
}

proc traceScalar {name1 name2 op} {
    global info
    set info [list $name1 $name2 $op [catch {uplevel 1 set $name1} msg] $msg]
}
proc traceScalarAppend {name1 name2 op} {
    global info
    lappend info $name1 $name2 $op [catch {uplevel 1 set $name1} msg] $msg
}
proc traceArray {name1 name2 op} {
    global info
    set info [list $name1 $name2 $op [catch {uplevel 1 set [set name1]($name2)} msg] $msg]
}
proc traceArray2 {name1 name2 op} {
    global info
    set info [list $name1 $name2 $op]
}
proc traceProc {name1 name2 op} {
    global info
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    error "trace returned error"
}
proc traceCheck {cmd args} {
    global info
    set info [list [catch $cmd msg] $msg]
}
proc traceCrtElement {value name1 name2 op} {
    uplevel set ${name1}($name2) $value
}
proc traceCommand {oldName newName op} {
    global info
    set info [list $oldName $newName $op]
}

test trace-0.0 {memory corruption in trace (Tcl Bug 484339)} {
    # You may need Purify or Electric Fence to reliably
    # see this one fail.
    catch {unset z}
    trace add variable z array {set z(foo) 1 ;#}
    set res "names: [array names z]"
    catch {unset ::z}
    trace variable ::z w {unset ::z; error "memory corruption";#}
    list [catch {set ::z 1} msg] $msg
} {1 {can't set "::z": memory corruption}}

# Read-tracing on variables

test trace-1.1 {trace variable reads} {
    catch {unset x}
    set info {}
    trace add variable x read traceScalar
    list [catch {set x} msg] $msg $info
} {1 {can't read "x": no such variable} {x {} read 1 {can't read "x": no such variable}}}
test trace-1.2 {trace variable reads} {
    catch {unset x}
    set x 123
    set info {}
    trace add variable x read traceScalar
    list [catch {set x} msg] $msg $info
} {0 123 {x {} read 0 123}}
test trace-1.3 {trace variable reads} {
    catch {unset x}
    set info {}
    trace add variable x read traceScalar
    set x 123
    set info
} {}
test trace-1.4 {trace array element reads} {
    catch {unset x}
    set info {}
    trace add variable x(2) read traceArray
    list [catch {set x(2)} msg] $msg $info
} {1 {can't read "x(2)": no such element in array} {x 2 read 1 {can't read "x(2)": no such element in array}}}
test trace-1.5 {trace array element reads} {
    catch {unset x}
    set x(2) zzz
    set info {}
    trace add variable x(2) read traceArray
    list [catch {set x(2)} msg] $msg $info
} {0 zzz {x 2 read 0 zzz}}
test trace-1.6 {trace array element reads} {
    catch {unset x}
    set info {}
    trace add variable x read traceArray2
    proc p {} {
        global x
        set x(2) willi
        return $x(2)
    }
    list [catch {p} msg] $msg $info
} {0 willi {x 2 read}}
test trace-1.7 {trace array element reads, create element undefined if nonexistant} {
    catch {unset x}
    set info {}
    trace add variable x read q
    proc q {name1 name2 op} {
        global info
        set info [list $name1 $name2 $op]
        global $name1
        set ${name1}($name2) wolf
    }
    proc p {} {
        global x
        set x(X) willi
        return $x(Y)
    }
    list [catch {p} msg] $msg $info
} {0 wolf {x Y read}}
test trace-1.8 {trace reads on whole arrays} {
    catch {unset x}
    set info {}
    trace add variable x read traceArray
    list [catch {set x(2)} msg] $msg $info
} {1 {can't read "x(2)": no such variable} {}}
test trace-1.9 {trace reads on whole arrays} {
    catch {unset x}
    set x(2) zzz
    set info {}
    trace add variable x read traceArray
    list [catch {set x(2)} msg] $msg $info
} {0 zzz {x 2 read 0 zzz}}
test trace-1.10 {trace variable reads} {
    catch {unset x}
    set x 444
    set info {}
    trace add variable x read traceScalar
    unset x
    set info
} {}
test trace-1.11 {read traces that modify the array structure} {
    catch {unset x}
    set x(bar) 0 
    trace variable x r {set x(foo) 1 ;#} 
    trace variable x r {unset -nocomplain x(bar) ;#} 
    array get x
} {}
test trace-1.12 {read traces that modify the array structure} {
    catch {unset x}
    set x(bar) 0 
    trace variable x r {unset -nocomplain x(bar) ;#} 
    trace variable x r {set x(foo) 1 ;#} 
    array get x
} {}
test trace-1.13 {read traces that modify the array structure} {
    catch {unset x}
    set x(bar) 0 
    trace variable x r {set x(foo) 1 ;#} 
    trace variable x r {unset -nocomplain x;#} 
    list [catch {array get x} res] $res
} {1 {can't read "x(bar)": no such variable}}
test trace-1.14 {read traces that modify the array structure} {
    catch {unset x}
    set x(bar) 0 
    trace variable x r {unset -nocomplain x;#} 
    trace variable x r {set x(foo) 1 ;#} 
    list [catch {array get x} res] $res
} {1 {can't read "x(bar)": no such variable}}

# Basic write-tracing on variables

test trace-2.1 {trace variable writes} {
    catch {unset x}
    set info {}
    trace add variable x write traceScalar
    set x 123
    set info
} {x {} write 0 123}
test trace-2.2 {trace writes to array elements} {
    catch {unset x}
    set info {}
    trace add variable x(33) write traceArray
    set x(33) 444
    set info
} {x 33 write 0 444}
test trace-2.3 {trace writes on whole arrays} {
    catch {unset x}
    set info {}
    trace add variable x write traceArray
    set x(abc) qq
    set info
} {x abc write 0 qq}
test trace-2.4 {trace variable writes} {
    catch {unset x}
    set x 1234
    set info {}
    trace add variable x write traceScalar
    set x
    set info
} {}
test trace-2.5 {trace variable writes} {
    catch {unset x}
    set x 1234
    set info {}
    trace add variable x write traceScalar
    unset x
    set info
} {}
test trace-2.6 {trace variable writes on compiled local} {
    #
    # Check correct function of whole array traces on compiled local
    # arrays [Bug 1770591]. The corresponding function for read traces is
    # already indirectly tested in trace-1.7
    #
    catch {unset x}
    set info {}
    proc p {} {
	trace add variable x write traceArray
	set x(X) willy
    }
    p
    set info








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    error "trace returned error"
}
proc traceCheck {cmd args} {
    global info
    set info [list [catch $cmd msg] $msg]
}
proc traceCrtElement {value name1 name2 op} {
    uplevel 1 set ${name1}($name2) $value
}
proc traceCommand {oldName newName op} {
    global info
    set info [list $oldName $newName $op]
}

test trace-0.0 {memory corruption in trace (Tcl Bug 484339)} {
    # You may need Purify or Electric Fence to reliably
    # see this one fail.
    unset -nocomplain z
    trace add variable z array {set z(foo) 1 ;#}
    set res "names: [array names z]"
    unset -nocomplain ::z
    trace variable ::z w {unset ::z; error "memory corruption";#}
    list [catch {set ::z 1} msg] $msg
} {1 {can't set "::z": memory corruption}}

# Read-tracing on variables

test trace-1.1 {trace variable reads} {
    unset -nocomplain x
    set info {}
    trace add variable x read traceScalar
    list [catch {set x} msg] $msg $info
} {1 {can't read "x": no such variable} {x {} read 1 {can't read "x": no such variable}}}
test trace-1.2 {trace variable reads} {
    unset -nocomplain x
    set x 123
    set info {}
    trace add variable x read traceScalar
    list [catch {set x} msg] $msg $info
} {0 123 {x {} read 0 123}}
test trace-1.3 {trace variable reads} {
    unset -nocomplain x
    set info {}
    trace add variable x read traceScalar
    set x 123
    set info
} {}
test trace-1.4 {trace array element reads} {
    unset -nocomplain x
    set info {}
    trace add variable x(2) read traceArray
    list [catch {set x(2)} msg] $msg $info
} {1 {can't read "x(2)": no such element in array} {x 2 read 1 {can't read "x(2)": no such element in array}}}
test trace-1.5 {trace array element reads} {
    unset -nocomplain x
    set x(2) zzz
    set info {}
    trace add variable x(2) read traceArray
    list [catch {set x(2)} msg] $msg $info
} {0 zzz {x 2 read 0 zzz}}
test trace-1.6 {trace array element reads} {
    unset -nocomplain x
    set info {}
    trace add variable x read traceArray2
    proc p {} {
        global x
        set x(2) willi
        return $x(2)
    }
    list [catch {p} msg] $msg $info
} {0 willi {x 2 read}}
test trace-1.7 {trace array element reads, create element undefined if nonexistant} {
    unset -nocomplain x
    set info {}
    trace add variable x read q
    proc q {name1 name2 op} {
        global info
        set info [list $name1 $name2 $op]
        global $name1
        set ${name1}($name2) wolf
    }
    proc p {} {
        global x
        set x(X) willi
        return $x(Y)
    }
    list [catch {p} msg] $msg $info
} {0 wolf {x Y read}}
test trace-1.8 {trace reads on whole arrays} {
    unset -nocomplain x
    set info {}
    trace add variable x read traceArray
    list [catch {set x(2)} msg] $msg $info
} {1 {can't read "x(2)": no such variable} {}}
test trace-1.9 {trace reads on whole arrays} {
    unset -nocomplain x
    set x(2) zzz
    set info {}
    trace add variable x read traceArray
    list [catch {set x(2)} msg] $msg $info
} {0 zzz {x 2 read 0 zzz}}
test trace-1.10 {trace variable reads} {
    unset -nocomplain x
    set x 444
    set info {}
    trace add variable x read traceScalar
    unset x
    set info
} {}
test trace-1.11 {read traces that modify the array structure} {
    unset -nocomplain x
    set x(bar) 0 
    trace variable x r {set x(foo) 1 ;#} 
    trace variable x r {unset -nocomplain x(bar) ;#} 
    array get x
} {}
test trace-1.12 {read traces that modify the array structure} {
    unset -nocomplain x
    set x(bar) 0 
    trace variable x r {unset -nocomplain x(bar) ;#} 
    trace variable x r {set x(foo) 1 ;#} 
    array get x
} {}
test trace-1.13 {read traces that modify the array structure} {
    unset -nocomplain x
    set x(bar) 0 
    trace variable x r {set x(foo) 1 ;#} 
    trace variable x r {unset -nocomplain x;#} 
    list [catch {array get x} res] $res
} {1 {can't read "x(bar)": no such variable}}
test trace-1.14 {read traces that modify the array structure} {
    unset -nocomplain x
    set x(bar) 0 
    trace variable x r {unset -nocomplain x;#} 
    trace variable x r {set x(foo) 1 ;#} 
    list [catch {array get x} res] $res
} {1 {can't read "x(bar)": no such variable}}

# Basic write-tracing on variables

test trace-2.1 {trace variable writes} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceScalar
    set x 123
    set info
} {x {} write 0 123}
test trace-2.2 {trace writes to array elements} {
    unset -nocomplain x
    set info {}
    trace add variable x(33) write traceArray
    set x(33) 444
    set info
} {x 33 write 0 444}
test trace-2.3 {trace writes on whole arrays} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceArray
    set x(abc) qq
    set info
} {x abc write 0 qq}
test trace-2.4 {trace variable writes} {
    unset -nocomplain x
    set x 1234
    set info {}
    trace add variable x write traceScalar
    set x
    set info
} {}
test trace-2.5 {trace variable writes} {
    unset -nocomplain x
    set x 1234
    set info {}
    trace add variable x write traceScalar
    unset x
    set info
} {}
test trace-2.6 {trace variable writes on compiled local} {
    #
    # Check correct function of whole array traces on compiled local
    # arrays [Bug 1770591]. The corresponding function for read traces is
    # already indirectly tested in trace-1.7
    #
    unset -nocomplain x
    set info {}
    proc p {} {
	trace add variable x write traceArray
	set x(X) willy
    }
    p
    set info
︙︙
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# append no longer triggers read traces when fetching the old values of
# variables before doing the append operation. However, lappend _does_
# still trigger these read traces. Also lappend triggers only one write
# trace: after appending all arguments to the list.

test trace-3.1 {trace variable read-modify-writes} {
    catch {unset x}
    set info {}
    trace add variable x read traceScalarAppend
    append x 123
    append x 456
    lappend x 789
    set info
} {x {} read 0 123456}
test trace-3.2 {trace variable read-modify-writes} {
    catch {unset x}
    set info {}
    trace add variable x {read write} traceScalarAppend
    append x 123
    lappend x 456
    set info
} {x {} write 0 123 x {} read 0 123 x {} write 0 {123 456}}

# Basic unset-tracing on variables

test trace-4.1 {trace variable unsets} {
    catch {unset x}
    set info {}
    trace add variable x unset traceScalar
    catch {unset x}
    set info
} {x {} unset 1 {can't read "x": no such variable}}
test trace-4.2 {variable mustn't exist during unset trace} {
    catch {unset x}
    set x 1234
    set info {}
    trace add variable x unset traceScalar
    unset x
    set info
} {x {} unset 1 {can't read "x": no such variable}}
test trace-4.3 {unset traces mustn't be called during reads and writes} {
    catch {unset x}
    set info {}
    trace add variable x unset traceScalar
    set x 44
    set x
    set info
} {}
test trace-4.4 {trace unsets on array elements} {
    catch {unset x}
    set x(0) 18
    set info {}
    trace add variable x(1) unset traceArray
    catch {unset x(1)}
    set info
} {x 1 unset 1 {can't read "x(1)": no such element in array}}
test trace-4.5 {trace unsets on array elements} {
    catch {unset x}
    set x(1) 18
    set info {}
    trace add variable x(1) unset traceArray
    unset x(1)
    set info
} {x 1 unset 1 {can't read "x(1)": no such element in array}}
test trace-4.6 {trace unsets on array elements} {
    catch {unset x}
    set x(1) 18
    set info {}
    trace add variable x(1) unset traceArray
    unset x
    set info
} {x 1 unset 1 {can't read "x(1)": no such variable}}
test trace-4.7 {trace unsets on whole arrays} {
    catch {unset x}
    set x(1) 18
    set info {}
    trace add variable x unset traceProc
    catch {unset x(0)}
    set info
} {}
test trace-4.8 {trace unsets on whole arrays} {
    catch {unset x}
    set x(1) 18
    set x(2) 144
    set x(3) 14
    set info {}
    trace add variable x unset traceProc
    unset x(1)
    set info
} {x 1 unset}
test trace-4.9 {trace unsets on whole arrays} {
    catch {unset x}
    set x(1) 18
    set x(2) 144
    set x(3) 14
    set info {}
    trace add variable x unset traceProc
    unset x
    set info
} {x {} unset}

# Array tracing on variables
test trace-5.1 {array traces fire on accesses via [array]} {
    catch {unset x}
    set x(b) 2
    trace add variable x array traceArray2
    set ::info {}
    array set x {a 1}
    set ::info
} {x {} array}
test trace-5.2 {array traces do not fire on normal accesses} {
    catch {unset x}
    set x(b) 2
    trace add variable x array traceArray2
    set ::info {}
    set x(a) 1
    set x(b) $x(a)
    set ::info
} {}
test trace-5.3 {array traces do not outlive variable} {
    catch {unset x}
    trace add variable x array traceArray2
    set ::info {}
    set x(a) 1
    unset x
    array set x {a 1}
    set ::info
} {}
test trace-5.4 {array traces properly listed in trace information} {
    catch {unset x}
    trace add variable x array traceArray2
    set result [trace info variable x]
    set result
} [list [list array traceArray2]]
test trace-5.5 {array traces properly listed in trace information} {
    catch {unset x}
    trace variable x a traceArray2
    set result [trace vinfo x]
    set result
} [list [list a traceArray2]]
test trace-5.6 {array traces don't fire on scalar variables} {
    catch {unset x}
    set x foo
    trace add variable x array traceArray2
    set ::info {}
    catch {array set x {a 1}}
    set ::info
} {}
test trace-5.7 {array traces fire for undefined variables} {
    catch {unset x}
    trace add variable x array traceArray2
    set ::info {}
    array set x {a 1}
    set ::info
} {x {} array}
test trace-5.8 {array traces fire for undefined variables} {
    catch {unset x}
    trace add variable x array {set x(foo) 1 ;#}
    set res "names: [array names x]"
} {names: foo}
    
# Trace multiple trace types at once.

test trace-6.1 {multiple ops traced at once} {
    catch {unset x}
    set info {}
    trace add variable x {read write unset} traceProc
    catch {set x}
    set x 22
    set x
    set x 33
    unset x
    set info
} {x {} read x {} write x {} read x {} write x {} unset}
test trace-6.2 {multiple ops traced on array element} {
    catch {unset x}
    set info {}
    trace add variable x(0) {read write unset} traceProc
    catch {set x(0)}
    set x(0) 22
    set x(0)
    set x(0) 33
    unset x(0)
    unset x
    set info
} {x 0 read x 0 write x 0 read x 0 write x 0 unset}
test trace-6.3 {multiple ops traced on whole array} {
    catch {unset x}
    set info {}
    trace add variable x {read write unset} traceProc
    catch {set x(0)}
    set x(0) 22
    set x(0)
    set x(0) 33
    unset x(0)
    unset x
    set info
} {x 0 write x 0 read x 0 write x 0 unset x {} unset}

# Check order of invocation of traces

test trace-7.1 {order of invocation of traces} {
    catch {unset x}
    set info {}
    trace add variable x read "traceTag 1"
    trace add variable x read "traceTag 2"
    trace add variable x read "traceTag 3"
    catch {set x}
    set x 22
    set x
    set info
} {3 2 1 3 2 1}
test trace-7.2 {order of invocation of traces} {
    catch {unset x}
    set x(0) 44
    set info {}
    trace add variable x(0) read "traceTag 1"
    trace add variable x(0) read "traceTag 2"
    trace add variable x(0) read "traceTag 3"
    set x(0)
    set info
} {3 2 1}
test trace-7.3 {order of invocation of traces} {
    catch {unset x}
    set x(0) 44
    set info {}
    trace add variable x(0) read "traceTag 1"
    trace add variable x read "traceTag A1"
    trace add variable x(0) read "traceTag 2"
    trace add variable x read "traceTag A2"
    trace add variable x(0) read "traceTag 3"
    trace add variable x read "traceTag A3"
    set x(0)
    set info
} {A3 A2 A1 3 2 1}

# Check effects of errors in trace procedures

test trace-8.1 {error returns from traces} {
    catch {unset x}
    set x 123
    set info {}
    trace add variable x read "traceTag 1"
    trace add variable x read traceError
    list [catch {set x} msg] $msg $info
} {1 {can't read "x": trace returned error} {}}
test trace-8.2 {error returns from traces} {
    catch {unset x}
    set x 123
    set info {}
    trace add variable x write "traceTag 1"
    trace add variable x write traceError
    list [catch {set x 44} msg] $msg $info
} {1 {can't set "x": trace returned error} {}}
test trace-8.3 {error returns from traces} {
    catch {unset x}
    set x 123
    set info {}
    trace add variable x write traceError
    list [catch {append x 44} msg] $msg $info
} {1 {can't set "x": trace returned error} {}}
test trace-8.4 {error returns from traces} {
    catch {unset x}
    set x 123
    set info {}
    trace add variable x unset "traceTag 1"
    trace add variable x unset traceError
    list [catch {unset x} msg] $msg $info
} {0 {} 1}
test trace-8.5 {error returns from traces} {
    catch {unset x}
    set x(0) 123
    set info {}
    trace add variable x(0) read "traceTag 1"
    trace add variable x read "traceTag 2"
    trace add variable x read traceError
    trace add variable x read "traceTag 3"
    list [catch {set x(0)} msg] $msg $info
} {1 {can't read "x(0)": trace returned error} 3}
test trace-8.6 {error returns from traces} {
    catch {unset x}
    set x 123
    trace add variable x unset traceError
    list [catch {unset x} msg] $msg
} {0 {}}
test trace-8.7 {error returns from traces} {
    # This test just makes sure that the memory for the error message
    # gets deallocated correctly when the trace is invoked again or
    # when the trace is deleted.
    catch {unset x}
    set x 123
    trace add variable x read traceError
    catch {set x}
    catch {set x}
    trace remove variable x read traceError
} {}
test trace-8.8 {error returns from traces} {
    # Yet more elaborate memory corruption testing that checks nothing
    # bad happens when the trace deletes itself and installs something
    # new.  Alas, there is no neat way to guarantee that this test will
    # fail if there is a problem, but that's life and with the new code
    # it should *never* fail.
    #
    # Adapted from Bug #219393 reported by Don Porter.
    catch {rename ::foo {}}
    proc foo {old args} {
	trace remove variable ::x write [list foo $old]
	trace add    variable ::x write [list foo $::x]
	error "foo"
    }
    catch {unset ::x ::y}
    set x junk
    trace add variable ::x write [list foo $x]
    for {set y 0} {$y<100} {incr y} {
	catch {set x junk}
    }
    unset x
} {}

# Check to see that variables are expunged before trace
# procedures are invoked, so trace procedure can even manipulate
# a new copy of the variables.

test trace-9.1 {be sure variable is unset before trace is called} {
    catch {unset x}
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel set x}}
    unset x
    set info
} {1 {can't read "x": no such variable}}
test trace-9.2 {be sure variable is unset before trace is called} {
    catch {unset x}
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel set x 22}}
    unset x
    concat $info [list [catch {set x} msg] $msg]
} {0 22 0 22}
test trace-9.3 {be sure traces are cleared before unset trace called} {
    catch {unset x}
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel trace info variable x}}
    unset x
    set info
} {0 {}}
test trace-9.4 {set new trace during unset trace} {
    catch {unset x}
    set x 33
    set info {}
    trace add variable x unset {traceCheck {global x; trace add variable x unset traceProc}}
    unset x
    concat $info [trace info variable x]
} {0 {} {unset traceProc}}

test trace-10.1 {make sure array elements are unset before traces are called} {
    catch {unset x}
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {uplevel set x(0)}}
    unset x(0)
    set info
} {1 {can't read "x(0)": no such element in array}}
test trace-10.2 {make sure array elements are unset before traces are called} {
    catch {unset x}
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {uplevel set x(0) zzz}}
    unset x(0)
    concat $info [list [catch {set x(0)} msg] $msg]
} {0 zzz 0 zzz}
test trace-10.3 {array elements are unset before traces are called} {
    catch {unset x}
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {global x; trace info variable x(0)}}
    unset x(0)
    set info
} {0 {}}
test trace-10.4 {set new array element trace during unset trace} {
    catch {unset x}
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {uplevel {trace add variable x(0) read {}}}}
    catch {unset x(0)}
    concat $info [trace info variable x(0)]
} {0 {} {read {}}}

test trace-11.1 {make sure arrays are unset before traces are called} {
    catch {unset x}
    set x(0) 33
    set info {}
    trace add variable x unset {traceCheck {uplevel set x(0)}}
    unset x
    set info
} {1 {can't read "x(0)": no such variable}}
test trace-11.2 {make sure arrays are unset before traces are called} {
    catch {unset x}
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {uplevel set x(y) 22}}
    unset x
    concat $info [list [catch {set x(y)} msg] $msg]
} {0 22 0 22}
test trace-11.3 {make sure arrays are unset before traces are called} {
    catch {unset x}
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {uplevel array exists x}}
    unset x
    set info
} {0 0}
test trace-11.4 {make sure arrays are unset before traces are called} {
    catch {unset x}
    set x(y) 33
    set info {}
    set cmd {traceCheck {uplevel {trace info variable x}}}
    trace add variable x unset $cmd
    unset x
    set info
} {0 {}}
test trace-11.5 {set new array trace during unset trace} {
    catch {unset x}
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {global x; trace add variable x read {}}}
    unset x
    concat $info [trace info variable x]
} {0 {} {read {}}}
test trace-11.6 {create scalar during array unset trace} {
    catch {unset x}
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {global x; set x 44}}
    unset x
    concat $info [list [catch {set x} msg] $msg]
} {0 44 0 44}

# Check special conditions (e.g. errors) in Tcl_TraceVar2.

test trace-12.1 {creating array when setting variable traces} {
    catch {unset x}
    set info {}
    trace add variable x(0) write traceProc
    list [catch {set x 22} msg] $msg
} {1 {can't set "x": variable is array}}
test trace-12.2 {creating array when setting variable traces} {
    catch {unset x}
    set info {}
    trace add variable x(0) write traceProc
    list [catch {set x(0)} msg] $msg
} {1 {can't read "x(0)": no such element in array}}
test trace-12.3 {creating array when setting variable traces} {
    catch {unset x}
    set info {}
    trace add variable x(0) write traceProc
    set x(0) 22
    set info
} {x 0 write}
test trace-12.4 {creating variable when setting variable traces} {
    catch {unset x}
    set info {}
    trace add variable x write traceProc
    list [catch {set x} msg] $msg
} {1 {can't read "x": no such variable}}
test trace-12.5 {creating variable when setting variable traces} {
    catch {unset x}
    set info {}
    trace add variable x write traceProc
    set x 22
    set info
} {x {} write}
test trace-12.6 {creating variable when setting variable traces} {
    catch {unset x}
    set info {}
    trace add variable x write traceProc
    set x(0) 22
    set info
} {x 0 write}
test trace-12.7 {create array element during read trace} {
    catch {unset x}
    set x(2) zzz
    trace add variable x read {traceCrtElement xyzzy}
    list [catch {set x(3)} msg] $msg
} {0 xyzzy}
test trace-12.8 {errors when setting variable traces} {
    catch {unset x}
    set x 44
    list [catch {trace add variable x(0) write traceProc} msg] $msg
} {1 {can't trace "x(0)": variable isn't array}}

# Check trace deletion

test trace-13.1 {delete one trace from another} {
    proc delTraces {args} {
	global x
	trace remove variable x read {traceTag 2}
	trace remove variable x read {traceTag 3}
	trace remove variable x read {traceTag 4}
    }
    catch {unset x}
    set x 44
    set info {}
    trace add variable x read {traceTag 1}
    trace add variable x read {traceTag 2}
    trace add variable x read {traceTag 3}
    trace add variable x read {traceTag 4}
    trace add variable x read delTraces 








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# append no longer triggers read traces when fetching the old values of
# variables before doing the append operation. However, lappend _does_
# still trigger these read traces. Also lappend triggers only one write
# trace: after appending all arguments to the list.

test trace-3.1 {trace variable read-modify-writes} {
    unset -nocomplain x
    set info {}
    trace add variable x read traceScalarAppend
    append x 123
    append x 456
    lappend x 789
    set info
} {x {} read 0 123456}
test trace-3.2 {trace variable read-modify-writes} {
    unset -nocomplain x
    set info {}
    trace add variable x {read write} traceScalarAppend
    append x 123
    lappend x 456
    set info
} {x {} write 0 123 x {} read 0 123 x {} write 0 {123 456}}

# Basic unset-tracing on variables

test trace-4.1 {trace variable unsets} {
    unset -nocomplain x
    set info {}
    trace add variable x unset traceScalar
    unset -nocomplain x
    set info
} {x {} unset 1 {can't read "x": no such variable}}
test trace-4.2 {variable mustn't exist during unset trace} {
    unset -nocomplain x
    set x 1234
    set info {}
    trace add variable x unset traceScalar
    unset x
    set info
} {x {} unset 1 {can't read "x": no such variable}}
test trace-4.3 {unset traces mustn't be called during reads and writes} {
    unset -nocomplain x
    set info {}
    trace add variable x unset traceScalar
    set x 44
    set x
    set info
} {}
test trace-4.4 {trace unsets on array elements} {
    unset -nocomplain x
    set x(0) 18
    set info {}
    trace add variable x(1) unset traceArray
    unset -nocomplain x(1)
    set info
} {x 1 unset 1 {can't read "x(1)": no such element in array}}
test trace-4.5 {trace unsets on array elements} {
    unset -nocomplain x
    set x(1) 18
    set info {}
    trace add variable x(1) unset traceArray
    unset x(1)
    set info
} {x 1 unset 1 {can't read "x(1)": no such element in array}}
test trace-4.6 {trace unsets on array elements} {
    unset -nocomplain x
    set x(1) 18
    set info {}
    trace add variable x(1) unset traceArray
    unset x
    set info
} {x 1 unset 1 {can't read "x(1)": no such variable}}
test trace-4.7 {trace unsets on whole arrays} {
    unset -nocomplain x
    set x(1) 18
    set info {}
    trace add variable x unset traceProc
    unset -nocomplain x(0)
    set info
} {}
test trace-4.8 {trace unsets on whole arrays} {
    unset -nocomplain x
    set x(1) 18
    set x(2) 144
    set x(3) 14
    set info {}
    trace add variable x unset traceProc
    unset x(1)
    set info
} {x 1 unset}
test trace-4.9 {trace unsets on whole arrays} {
    unset -nocomplain x
    set x(1) 18
    set x(2) 144
    set x(3) 14
    set info {}
    trace add variable x unset traceProc
    unset x
    set info
} {x {} unset}

# Array tracing on variables
test trace-5.1 {array traces fire on accesses via [array]} {
    unset -nocomplain x
    set x(b) 2
    trace add variable x array traceArray2
    set ::info {}
    array set x {a 1}
    set ::info
} {x {} array}
test trace-5.2 {array traces do not fire on normal accesses} {
    unset -nocomplain x
    set x(b) 2
    trace add variable x array traceArray2
    set ::info {}
    set x(a) 1
    set x(b) $x(a)
    set ::info
} {}
test trace-5.3 {array traces do not outlive variable} {
    unset -nocomplain x
    trace add variable x array traceArray2
    set ::info {}
    set x(a) 1
    unset x
    array set x {a 1}
    set ::info
} {}
test trace-5.4 {array traces properly listed in trace information} {
    unset -nocomplain x
    trace add variable x array traceArray2
    set result [trace info variable x]
    set result
} [list [list array traceArray2]]
test trace-5.5 {array traces properly listed in trace information} {
    unset -nocomplain x
    trace variable x a traceArray2
    set result [trace vinfo x]
    set result
} [list [list a traceArray2]]
test trace-5.6 {array traces don't fire on scalar variables} {
    unset -nocomplain x
    set x foo
    trace add variable x array traceArray2
    set ::info {}
    catch {array set x {a 1}}
    set ::info
} {}
test trace-5.7 {array traces fire for undefined variables} {
    unset -nocomplain x
    trace add variable x array traceArray2
    set ::info {}
    array set x {a 1}
    set ::info
} {x {} array}
test trace-5.8 {array traces fire for undefined variables} {
    unset -nocomplain x
    trace add variable x array {set x(foo) 1 ;#}
    set res "names: [array names x]"
} {names: foo}
    
# Trace multiple trace types at once.

test trace-6.1 {multiple ops traced at once} {
    unset -nocomplain x
    set info {}
    trace add variable x {read write unset} traceProc
    catch {set x}
    set x 22
    set x
    set x 33
    unset x
    set info
} {x {} read x {} write x {} read x {} write x {} unset}
test trace-6.2 {multiple ops traced on array element} {
    unset -nocomplain x
    set info {}
    trace add variable x(0) {read write unset} traceProc
    catch {set x(0)}
    set x(0) 22
    set x(0)
    set x(0) 33
    unset x(0)
    unset x
    set info
} {x 0 read x 0 write x 0 read x 0 write x 0 unset}
test trace-6.3 {multiple ops traced on whole array} {
    unset -nocomplain x
    set info {}
    trace add variable x {read write unset} traceProc
    catch {set x(0)}
    set x(0) 22
    set x(0)
    set x(0) 33
    unset x(0)
    unset x
    set info
} {x 0 write x 0 read x 0 write x 0 unset x {} unset}

# Check order of invocation of traces

test trace-7.1 {order of invocation of traces} {
    unset -nocomplain x
    set info {}
    trace add variable x read "traceTag 1"
    trace add variable x read "traceTag 2"
    trace add variable x read "traceTag 3"
    catch {set x}
    set x 22
    set x
    set info
} {3 2 1 3 2 1}
test trace-7.2 {order of invocation of traces} {
    unset -nocomplain x
    set x(0) 44
    set info {}
    trace add variable x(0) read "traceTag 1"
    trace add variable x(0) read "traceTag 2"
    trace add variable x(0) read "traceTag 3"
    set x(0)
    set info
} {3 2 1}
test trace-7.3 {order of invocation of traces} {
    unset -nocomplain x
    set x(0) 44
    set info {}
    trace add variable x(0) read "traceTag 1"
    trace add variable x read "traceTag A1"
    trace add variable x(0) read "traceTag 2"
    trace add variable x read "traceTag A2"
    trace add variable x(0) read "traceTag 3"
    trace add variable x read "traceTag A3"
    set x(0)
    set info
} {A3 A2 A1 3 2 1}

# Check effects of errors in trace procedures

test trace-8.1 {error returns from traces} {
    unset -nocomplain x
    set x 123
    set info {}
    trace add variable x read "traceTag 1"
    trace add variable x read traceError
    list [catch {set x} msg] $msg $info
} {1 {can't read "x": trace returned error} {}}
test trace-8.2 {error returns from traces} {
    unset -nocomplain x
    set x 123
    set info {}
    trace add variable x write "traceTag 1"
    trace add variable x write traceError
    list [catch {set x 44} msg] $msg $info
} {1 {can't set "x": trace returned error} {}}
test trace-8.3 {error returns from traces} {
    unset -nocomplain x
    set x 123
    set info {}
    trace add variable x write traceError
    list [catch {append x 44} msg] $msg $info
} {1 {can't set "x": trace returned error} {}}
test trace-8.4 {error returns from traces} {
    unset -nocomplain x
    set x 123
    set info {}
    trace add variable x unset "traceTag 1"
    trace add variable x unset traceError
    list [catch {unset x} msg] $msg $info
} {0 {} 1}
test trace-8.5 {error returns from traces} {
    unset -nocomplain x
    set x(0) 123
    set info {}
    trace add variable x(0) read "traceTag 1"
    trace add variable x read "traceTag 2"
    trace add variable x read traceError
    trace add variable x read "traceTag 3"
    list [catch {set x(0)} msg] $msg $info
} {1 {can't read "x(0)": trace returned error} 3}
test trace-8.6 {error returns from traces} {
    unset -nocomplain x
    set x 123
    trace add variable x unset traceError
    list [catch {unset x} msg] $msg
} {0 {}}
test trace-8.7 {error returns from traces} {
    # This test just makes sure that the memory for the error message
    # gets deallocated correctly when the trace is invoked again or
    # when the trace is deleted.
    unset -nocomplain x
    set x 123
    trace add variable x read traceError
    catch {set x}
    catch {set x}
    trace remove variable x read traceError
} {}
test trace-8.8 {error returns from traces} {
    # Yet more elaborate memory corruption testing that checks nothing
    # bad happens when the trace deletes itself and installs something
    # new.  Alas, there is no neat way to guarantee that this test will
    # fail if there is a problem, but that's life and with the new code
    # it should *never* fail.
    #
    # Adapted from Bug #219393 reported by Don Porter.
    catch {rename ::foo {}}
    proc foo {old args} {
	trace remove variable ::x write [list foo $old]
	trace add    variable ::x write [list foo $::x]
	error "foo"
    }
    unset -nocomplain ::x ::y
    set x junk
    trace add variable ::x write [list foo $x]
    for {set y 0} {$y<100} {incr y} {
	catch {set x junk}
    }
    unset x
} {}

# Check to see that variables are expunged before trace
# procedures are invoked, so trace procedure can even manipulate
# a new copy of the variables.

test trace-9.1 {be sure variable is unset before trace is called} {
    unset -nocomplain x
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel 1 set x}}
    unset x
    set info
} {1 {can't read "x": no such variable}}
test trace-9.2 {be sure variable is unset before trace is called} {
    unset -nocomplain x
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel 1 set x 22}}
    unset x
    concat $info [list [catch {set x} msg] $msg]
} {0 22 0 22}
test trace-9.3 {be sure traces are cleared before unset trace called} {
    unset -nocomplain x
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel 1 trace info variable x}}
    unset x
    set info
} {0 {}}
test trace-9.4 {set new trace during unset trace} {
    unset -nocomplain x
    set x 33
    set info {}
    trace add variable x unset {traceCheck {global x; trace add variable x unset traceProc}}
    unset x
    concat $info [trace info variable x]
} {0 {} {unset traceProc}}

test trace-10.1 {make sure array elements are unset before traces are called} {
    unset -nocomplain x
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {uplevel 1 set x(0)}}
    unset x(0)
    set info
} {1 {can't read "x(0)": no such element in array}}
test trace-10.2 {make sure array elements are unset before traces are called} {
    unset -nocomplain x
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {uplevel 1 set x(0) zzz}}
    unset x(0)
    concat $info [list [catch {set x(0)} msg] $msg]
} {0 zzz 0 zzz}
test trace-10.3 {array elements are unset before traces are called} {
    unset -nocomplain x
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {global x; trace info variable x(0)}}
    unset x(0)
    set info
} {0 {}}
test trace-10.4 {set new array element trace during unset trace} {
    unset -nocomplain x
    set x(0) 33
    set info {}
    trace add variable x(0) unset {traceCheck {uplevel 1 {trace add variable x(0) read {}}}}
    unset -nocomplain x(0)
    concat $info [trace info variable x(0)]
} {0 {} {read {}}}

test trace-11.1 {make sure arrays are unset before traces are called} {
    unset -nocomplain x
    set x(0) 33
    set info {}
    trace add variable x unset {traceCheck {uplevel 1 set x(0)}}
    unset x
    set info
} {1 {can't read "x(0)": no such variable}}
test trace-11.2 {make sure arrays are unset before traces are called} {
    unset -nocomplain x
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {uplevel 1 set x(y) 22}}
    unset x
    concat $info [list [catch {set x(y)} msg] $msg]
} {0 22 0 22}
test trace-11.3 {make sure arrays are unset before traces are called} {
    unset -nocomplain x
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {uplevel 1 array exists x}}
    unset x
    set info
} {0 0}
test trace-11.4 {make sure arrays are unset before traces are called} {
    unset -nocomplain x
    set x(y) 33
    set info {}
    set cmd {traceCheck {uplevel 1 {trace info variable x}}}
    trace add variable x unset $cmd
    unset x
    set info
} {0 {}}
test trace-11.5 {set new array trace during unset trace} {
    unset -nocomplain x
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {global x; trace add variable x read {}}}
    unset x
    concat $info [trace info variable x]
} {0 {} {read {}}}
test trace-11.6 {create scalar during array unset trace} {
    unset -nocomplain x
    set x(y) 33
    set info {}
    trace add variable x unset {traceCheck {global x; set x 44}}
    unset x
    concat $info [list [catch {set x} msg] $msg]
} {0 44 0 44}

# Check special conditions (e.g. errors) in Tcl_TraceVar2.

test trace-12.1 {creating array when setting variable traces} {
    unset -nocomplain x
    set info {}
    trace add variable x(0) write traceProc
    list [catch {set x 22} msg] $msg
} {1 {can't set "x": variable is array}}
test trace-12.2 {creating array when setting variable traces} {
    unset -nocomplain x
    set info {}
    trace add variable x(0) write traceProc
    list [catch {set x(0)} msg] $msg
} {1 {can't read "x(0)": no such element in array}}
test trace-12.3 {creating array when setting variable traces} {
    unset -nocomplain x
    set info {}
    trace add variable x(0) write traceProc
    set x(0) 22
    set info
} {x 0 write}
test trace-12.4 {creating variable when setting variable traces} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceProc
    list [catch {set x} msg] $msg
} {1 {can't read "x": no such variable}}
test trace-12.5 {creating variable when setting variable traces} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceProc
    set x 22
    set info
} {x {} write}
test trace-12.6 {creating variable when setting variable traces} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceProc
    set x(0) 22
    set info
} {x 0 write}
test trace-12.7 {create array element during read trace} {
    unset -nocomplain x
    set x(2) zzz
    trace add variable x read {traceCrtElement xyzzy}
    list [catch {set x(3)} msg] $msg
} {0 xyzzy}
test trace-12.8 {errors when setting variable traces} {
    unset -nocomplain x
    set x 44
    list [catch {trace add variable x(0) write traceProc} msg] $msg
} {1 {can't trace "x(0)": variable isn't array}}

# Check trace deletion

test trace-13.1 {delete one trace from another} {
    proc delTraces {args} {
	global x
	trace remove variable x read {traceTag 2}
	trace remove variable x read {traceTag 3}
	trace remove variable x read {traceTag 4}
    }
    unset -nocomplain x
    set x 44
    set info {}
    trace add variable x read {traceTag 1}
    trace add variable x read {traceTag 2}
    trace add variable x read {traceTag 3}
    trace add variable x read {traceTag 4}
    trace add variable x read delTraces
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} [list 1 "wrong # args: should be \"trace variable name ops command\""]
test trace-14.11 {trace command, "trace variable" errors} {
    list [catch {trace variable x y z} msg] $msg
} [list 1 "bad operations \"y\": should be one or more of rwua"]


test trace-14.12 {trace command ("remove variable" option)} {
    catch {unset x}
    set info {}
    trace add variable x write traceProc
    trace remove variable x write traceProc
} {}
test trace-14.13 {trace command ("remove variable" option)} {
    catch {unset x}
    set info {}
    trace add variable x write traceProc
    trace remove variable x write traceProc
    set x 12345
    set info
} {}
test trace-14.14 {trace command ("remove variable" option)} {
    catch {unset x}
    set info {}
    trace add variable x write {traceTag 1}
    trace add variable x write traceProc
    trace add variable x write {traceTag 2}
    set x yy
    trace remove variable x write traceProc
    set x 12345
    trace remove variable x write {traceTag 1}
    set x foo
    trace remove variable x write {traceTag 2}
    set x gorp
    set info
} {2 x {} write 1 2 1 2}
test trace-14.15 {trace command ("remove variable" option)} {
    catch {unset x}
    set info {}
    trace add variable x write {traceTag 1}
    trace remove variable x write non_existent
    set x 12345
    set info
} {1}
test trace-14.16 {trace command ("info variable" option)} {
    catch {unset x}
    trace add variable x write {traceTag 1}
    trace add variable x write traceProc
    trace add variable x write {traceTag 2}
    trace info variable x
} {{write {traceTag 2}} {write traceProc} {write {traceTag 1}}}
test trace-14.17 {trace command ("info variable" option)} {
    catch {unset x}
    trace info variable x
} {}
test trace-14.18 {trace command ("info variable" option)} {
    catch {unset x}
    trace info variable x(0)
} {}
test trace-14.19 {trace command ("info variable" option)} {
    catch {unset x}
    set x 44
    trace info variable x(0)
} {}
test trace-14.20 {trace command ("info variable" option)} {
    catch {unset x}
    set x 44
    trace add variable x write {traceTag 1}
    proc check {} {global x; trace info variable x}
    check
} {{write {traceTag 1}}}

# Check fancy trace commands (long ones, weird arguments, etc.)

test trace-15.1 {long trace command} {
    catch {unset x}
    set info {}
    trace add variable x write {traceTag {This is a very very long argument.  It's \
	designed to test out the facilities of TraceVarProc for dealing \
	with such long arguments by malloc-ing space.  One possibility \
	is that space doesn't get freed properly.  If this happens, then \
	invoking this test over and over again will eventually leak memory.}}
    set x 44
    set info
} {This is a very very long argument.  It's \
	designed to test out the facilities of TraceVarProc for dealing \
	with such long arguments by malloc-ing space.  One possibility \
	is that space doesn't get freed properly.  If this happens, then \
	invoking this test over and over again will eventually leak memory.}
test trace-15.2 {long trace command result to ignore} {
    proc longResult {args} {return "quite a bit of text, designed to
	generate a core leak if this command file is invoked over and over again
	and memory isn't being recycled correctly"}
    catch {unset x}
    trace add variable x write longResult
    set x 44
    set x 5
    set x abcde
} abcde
test trace-15.3 {special list-handling in trace commands} {
    catch {unset "x y z"}
    set "x y z(a\n\{)" 44
    set info {}
    trace add variable "x y z(a\n\{)" write traceProc
    set "x y z(a\n\{)" 33
    set info
} "{x y z} a\\n\\\{ write"

# Check for proper handling of unsets during traces.

proc traceUnset {unsetName args} {
    global info
    upvar $unsetName x
    lappend info [catch {unset x} msg] $msg [catch {set x} msg] $msg
}
proc traceReset {unsetName resetName args} {
    global info
    upvar $unsetName x $resetName y
    lappend info [catch {unset x} msg] $msg [catch {set y xyzzy} msg] $msg
}
proc traceReset2 {unsetName resetName args} {
    global info
    lappend info [catch {uplevel unset $unsetName} msg] $msg \
	    [catch {uplevel set $resetName xyzzy} msg] $msg
}
proc traceAppend {string name1 name2 op} {
    global info
    lappend info $string
}

test trace-16.1 {unsets during read traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y read {traceUnset y}
    trace add variable y unset {traceAppend unset}
    lappend info [catch {set y} msg] $msg
} {unset 0 {} 1 {can't read "x": no such variable} 1 {can't read "y": no such variable}}
test trace-16.2 {unsets during read traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceUnset y(0)}
    lappend info [catch {set y(0)} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 1 {can't read "y(0)": no such element in array}}
test trace-16.3 {unsets during read traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceUnset y}
    lappend info [catch {set y(0)} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 1 {can't read "y(0)": no such variable}}
test trace-16.4 {unsets during read traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y read {traceReset y y}
    lappend info [catch {set y} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.5 {unsets during read traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceReset y(0) y(0)}
    lappend info [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.6 {unsets during read traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceReset y y(0)}
    lappend info [catch {set y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 1 {can't set "y": upvar refers to element in deleted array} 1 {can't read "y(0)": no such variable} 1 {can't read "y(0)": no such variable}}
test trace-16.7 {unsets during read traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceReset2 y y(0)}
    lappend info [catch {set y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 1 {can't read "y(0)": no such element in array} 0 xyzzy}
test trace-16.8 {unsets during write traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y write {traceUnset y}
    trace add variable y unset {traceAppend unset}
    lappend info [catch {set y xxx} msg] $msg
} {unset 0 {} 1 {can't read "x": no such variable} 0 {}}
test trace-16.9 {unsets during write traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceUnset y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 0 {}}
test trace-16.10 {unsets during write traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceUnset y}
    lappend info [catch {set y(0) xxx} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 0 {}}
test trace-16.11 {unsets during write traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y write {traceReset y y}
    lappend info [catch {set y xxx} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.12 {unsets during write traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceReset y(0) y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.13 {unsets during write traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceReset y y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 1 {can't set "y": upvar refers to element in deleted array} 0 {} 1 {can't read "y(0)": no such variable}}
test trace-16.14 {unsets during write traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceReset2 y y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.15 {unsets during unset traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y unset {traceUnset y}
    lappend info [catch {unset y} msg] $msg [catch {set y} msg] $msg
} {1 {can't unset "x": no such variable} 1 {can't read "x": no such variable} 0 {} 1 {can't read "y": no such variable}}
test trace-16.16 {unsets during unset traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceUnset y(0)}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {1 {can't unset "x": no such variable} 1 {can't read "x": no such variable} 0 {} 1 {can't read "y(0)": no such element in array}}
test trace-16.17 {unsets during unset traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceUnset y}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 0 {} 1 {can't read "y(0)": no such variable}}
test trace-16.18 {unsets during unset traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y unset {traceReset2 y y}
    lappend info [catch {unset y} msg] $msg [catch {set y} msg] $msg
} {1 {can't unset "y": no such variable} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.19 {unsets during unset traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceReset2 y(0) y(0)}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {1 {can't unset "y(0)": no such element in array} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.20 {unsets during unset traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceReset2 y y(0)}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.21 {unsets cancelling traces} {
    catch {unset y}
    set y 1234
    set info {}
    trace add variable y read {traceAppend first}
    trace add variable y read {traceUnset y}
    trace add variable y read {traceAppend third}
    trace add variable y unset {traceAppend unset}
    lappend info [catch {set y} msg] $msg
} {third unset 0 {} 1 {can't read "x": no such variable} 1 {can't read "y": no such variable}}
test trace-16.22 {unsets cancelling traces} {
    catch {unset y}
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceAppend first}
    trace add variable y(0) read {traceUnset y}
    trace add variable y(0) read {traceAppend third}
    trace add variable y(0) unset {traceAppend unset}
    lappend info [catch {set y(0)} msg] $msg
} {third unset 0 {} 1 {can't read "x": no such variable} 1 {can't read "y(0)": no such variable}}

# Check various non-interference between traces and other things.

test trace-17.1 {trace doesn't prevent unset errors} {
    catch {unset x}
    set info {}
    trace add variable x unset {traceProc}
    list [catch {unset x} msg] $msg $info
} {1 {can't unset "x": no such variable} {x {} unset}}
test trace-17.2 {traced variables must survive procedure exits} {
    catch {unset x}
    proc p1 {} {global x; trace add variable x write traceProc}
    p1
    trace info variable x
} {{write traceProc}}
test trace-17.3 {traced variables must survive procedure exits} {
    catch {unset x}
    set info {}
    proc p1 {} {global x; trace add variable x write traceProc}
    p1
    set x 44
    set info
} {x {} write}

# Be sure that procedure frames are released before unset traces
# are invoked.

test trace-18.1 {unset traces on procedure returns} {
    proc p1 {x y} {set a 44; p2 14}
    proc p2 {z} {trace add variable z unset {traceCheck {lsort [uplevel {info vars}]}}}
    set info {}
    p1 foo bar
    set info
} {0 {a x y}}
test trace-18.2 {namespace delete / trace vdelete combo} {
    namespace eval ::foo {
	variable x 123








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} [list 1 "wrong # args: should be \"trace variable name ops command\""]
test trace-14.11 {trace command, "trace variable" errors} {
    list [catch {trace variable x y z} msg] $msg
} [list 1 "bad operations \"y\": should be one or more of rwua"]


test trace-14.12 {trace command ("remove variable" option)} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceProc
    trace remove variable x write traceProc
} {}
test trace-14.13 {trace command ("remove variable" option)} {
    unset -nocomplain x
    set info {}
    trace add variable x write traceProc
    trace remove variable x write traceProc
    set x 12345
    set info
} {}
test trace-14.14 {trace command ("remove variable" option)} {
    unset -nocomplain x
    set info {}
    trace add variable x write {traceTag 1}
    trace add variable x write traceProc
    trace add variable x write {traceTag 2}
    set x yy
    trace remove variable x write traceProc
    set x 12345
    trace remove variable x write {traceTag 1}
    set x foo
    trace remove variable x write {traceTag 2}
    set x gorp
    set info
} {2 x {} write 1 2 1 2}
test trace-14.15 {trace command ("remove variable" option)} {
    unset -nocomplain x
    set info {}
    trace add variable x write {traceTag 1}
    trace remove variable x write non_existent
    set x 12345
    set info
} {1}
test trace-14.16 {trace command ("info variable" option)} {
    unset -nocomplain x
    trace add variable x write {traceTag 1}
    trace add variable x write traceProc
    trace add variable x write {traceTag 2}
    trace info variable x
} {{write {traceTag 2}} {write traceProc} {write {traceTag 1}}}
test trace-14.17 {trace command ("info variable" option)} {
    unset -nocomplain x
    trace info variable x
} {}
test trace-14.18 {trace command ("info variable" option)} {
    unset -nocomplain x
    trace info variable x(0)
} {}
test trace-14.19 {trace command ("info variable" option)} {
    unset -nocomplain x
    set x 44
    trace info variable x(0)
} {}
test trace-14.20 {trace command ("info variable" option)} {
    unset -nocomplain x
    set x 44
    trace add variable x write {traceTag 1}
    proc check {} {global x; trace info variable x}
    check
} {{write {traceTag 1}}}

# Check fancy trace commands (long ones, weird arguments, etc.)

test trace-15.1 {long trace command} {
    unset -nocomplain x
    set info {}
    trace add variable x write {traceTag {This is a very very long argument.  It's \
	designed to test out the facilities of TraceVarProc for dealing \
	with such long arguments by malloc-ing space.  One possibility \
	is that space doesn't get freed properly.  If this happens, then \
	invoking this test over and over again will eventually leak memory.}}
    set x 44
    set info
} {This is a very very long argument.  It's \
	designed to test out the facilities of TraceVarProc for dealing \
	with such long arguments by malloc-ing space.  One possibility \
	is that space doesn't get freed properly.  If this happens, then \
	invoking this test over and over again will eventually leak memory.}
test trace-15.2 {long trace command result to ignore} {
    proc longResult {args} {return "quite a bit of text, designed to
	generate a core leak if this command file is invoked over and over again
	and memory isn't being recycled correctly"}
    unset -nocomplain x
    trace add variable x write longResult
    set x 44
    set x 5
    set x abcde
} abcde
test trace-15.3 {special list-handling in trace commands} {
    unset -nocomplain "x y z"
    set "x y z(a\n\{)" 44
    set info {}
    trace add variable "x y z(a\n\{)" write traceProc
    set "x y z(a\n\{)" 33
    set info
} "{x y z} a\\n\\\{ write"

# Check for proper handling of unsets during traces.

proc traceUnset {unsetName args} {
    global info
    upvar 1 $unsetName x
    lappend info [catch {unset x} msg] $msg [catch {set x} msg] $msg
}
proc traceReset {unsetName resetName args} {
    global info
    upvar 1 $unsetName x $resetName y
    lappend info [catch {unset x} msg] $msg [catch {set y xyzzy} msg] $msg
}
proc traceReset2 {unsetName resetName args} {
    global info
    lappend info [catch {uplevel 1 unset $unsetName} msg] $msg \
	    [catch {uplevel 1 set $resetName xyzzy} msg] $msg
}
proc traceAppend {string name1 name2 op} {
    global info
    lappend info $string
}

test trace-16.1 {unsets during read traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y read {traceUnset y}
    trace add variable y unset {traceAppend unset}
    lappend info [catch {set y} msg] $msg
} {unset 0 {} 1 {can't read "x": no such variable} 1 {can't read "y": no such variable}}
test trace-16.2 {unsets during read traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceUnset y(0)}
    lappend info [catch {set y(0)} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 1 {can't read "y(0)": no such element in array}}
test trace-16.3 {unsets during read traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceUnset y}
    lappend info [catch {set y(0)} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 1 {can't read "y(0)": no such variable}}
test trace-16.4 {unsets during read traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y read {traceReset y y}
    lappend info [catch {set y} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.5 {unsets during read traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceReset y(0) y(0)}
    lappend info [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.6 {unsets during read traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceReset y y(0)}
    lappend info [catch {set y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 1 {can't set "y": upvar refers to element in deleted array} 1 {can't read "y(0)": no such variable} 1 {can't read "y(0)": no such variable}}
test trace-16.7 {unsets during read traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceReset2 y y(0)}
    lappend info [catch {set y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 1 {can't read "y(0)": no such element in array} 0 xyzzy}
test trace-16.8 {unsets during write traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y write {traceUnset y}
    trace add variable y unset {traceAppend unset}
    lappend info [catch {set y xxx} msg] $msg
} {unset 0 {} 1 {can't read "x": no such variable} 0 {}}
test trace-16.9 {unsets during write traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceUnset y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 0 {}}
test trace-16.10 {unsets during write traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceUnset y}
    lappend info [catch {set y(0) xxx} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 0 {}}
test trace-16.11 {unsets during write traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y write {traceReset y y}
    lappend info [catch {set y xxx} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.12 {unsets during write traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceReset y(0) y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg
} {0 {} 0 xyzzy 0 xyzzy}
test trace-16.13 {unsets during write traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceReset y y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 1 {can't set "y": upvar refers to element in deleted array} 0 {} 1 {can't read "y(0)": no such variable}}
test trace-16.14 {unsets during write traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) write {traceReset2 y y(0)}
    lappend info [catch {set y(0) xxx} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.15 {unsets during unset traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y unset {traceUnset y}
    lappend info [catch {unset y} msg] $msg [catch {set y} msg] $msg
} {1 {can't unset "x": no such variable} 1 {can't read "x": no such variable} 0 {} 1 {can't read "y": no such variable}}
test trace-16.16 {unsets during unset traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceUnset y(0)}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {1 {can't unset "x": no such variable} 1 {can't read "x": no such variable} 0 {} 1 {can't read "y(0)": no such element in array}}
test trace-16.17 {unsets during unset traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceUnset y}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 1 {can't read "x": no such variable} 0 {} 1 {can't read "y(0)": no such variable}}
test trace-16.18 {unsets during unset traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y unset {traceReset2 y y}
    lappend info [catch {unset y} msg] $msg [catch {set y} msg] $msg
} {1 {can't unset "y": no such variable} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.19 {unsets during unset traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceReset2 y(0) y(0)}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {1 {can't unset "y(0)": no such element in array} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.20 {unsets during unset traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) unset {traceReset2 y y(0)}
    lappend info [catch {unset y(0)} msg] $msg [catch {set y(0)} msg] $msg
} {0 {} 0 xyzzy 0 {} 0 xyzzy}
test trace-16.21 {unsets cancelling traces} {
    unset -nocomplain y
    set y 1234
    set info {}
    trace add variable y read {traceAppend first}
    trace add variable y read {traceUnset y}
    trace add variable y read {traceAppend third}
    trace add variable y unset {traceAppend unset}
    lappend info [catch {set y} msg] $msg
} {third unset 0 {} 1 {can't read "x": no such variable} 1 {can't read "y": no such variable}}
test trace-16.22 {unsets cancelling traces} {
    unset -nocomplain y
    set y(0) 1234
    set info {}
    trace add variable y(0) read {traceAppend first}
    trace add variable y(0) read {traceUnset y}
    trace add variable y(0) read {traceAppend third}
    trace add variable y(0) unset {traceAppend unset}
    lappend info [catch {set y(0)} msg] $msg
} {third unset 0 {} 1 {can't read "x": no such variable} 1 {can't read "y(0)": no such variable}}

# Check various non-interference between traces and other things.

test trace-17.1 {trace doesn't prevent unset errors} {
    unset -nocomplain x
    set info {}
    trace add variable x unset {traceProc}
    list [catch {unset x} msg] $msg $info
} {1 {can't unset "x": no such variable} {x {} unset}}
test trace-17.2 {traced variables must survive procedure exits} {
    unset -nocomplain x
    proc p1 {} {global x; trace add variable x write traceProc}
    p1
    trace info variable x
} {{write traceProc}}
test trace-17.3 {traced variables must survive procedure exits} {
    unset -nocomplain x
    set info {}
    proc p1 {} {global x; trace add variable x write traceProc}
    p1
    set x 44
    set info
} {x {} write}

# Be sure that procedure frames are released before unset traces
# are invoked.

test trace-18.1 {unset traces on procedure returns} {
    proc p1 {x y} {set a 44; p2 14}
    proc p2 {z} {trace add variable z unset {traceCheck {lsort [uplevel 1 {info vars}]}}}
    set info {}
    p1 foo bar
    set info
} {0 {a x y}}
test trace-18.2 {namespace delete / trace vdelete combo} {
    namespace eval ::foo {
	variable x 123
︙︙
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280

    rename doTrace {}
    set info
} 1110

# Delete arrays when done, so they can be re-used as scalars
# elsewhere.

catch {unset x}
catch {unset y}

test trace-19.0.1 {trace add command (command existence)} {
    # Just in case!
    catch {rename nosuchname ""}
    list [catch {trace add command nosuchname rename traceCommand} msg] $msg
} {1 {unknown command "nosuchname"}}
test trace-19.0.2 {trace add command (command existence in ns)} {








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1263
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1265
1266
1267
1268
1269
1270

1271
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1273
1274
1275
1276
1277

    rename doTrace {}
    set info
} 1110

# Delete arrays when done, so they can be re-used as scalars
# elsewhere.

unset -nocomplain x y


test trace-19.0.1 {trace add command (command existence)} {
    # Just in case!
    catch {rename nosuchname ""}
    list [catch {trace add command nosuchname rename traceCommand} msg] $msg
} {1 {unknown command "nosuchname"}}
test trace-19.0.2 {trace add command (command existence in ns)} {
︙︙
1538
1539
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1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553


proc foo {b} { set a $b }


# Delete arrays when done, so they can be re-used as scalars
# elsewhere.

catch {unset x}
catch {unset y}

# Delete procedures when done, so we don't clash with other tests
# (e.g. foobar will clash with 'unknown' tests).
catch {rename foobar {}}
catch {rename foo {}}
catch {rename bar {}}









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<








1535
1536
1537
1538
1539
1540
1541
1542

1543
1544
1545
1546
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1548
1549


proc foo {b} { set a $b }


# Delete arrays when done, so they can be re-used as scalars
# elsewhere.

unset -nocomplain x y


# Delete procedures when done, so we don't clash with other tests
# (e.g. foobar will clash with 'unknown' tests).
catch {rename foobar {}}
catch {rename foo {}}
catch {rename bar {}}
︙︙
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060

    update
    after idle {set a "idle"}
    foo

    trace remove execution foo {enter enterstep leavestep leave} \
        [list traceExecute foo]
    rename foo {}
    catch {unset a}
    join $info "\n"
} {foo foo enter
foo {set a 1} enterstep
foo {set a 1} 0 1 leavestep
foo {update idletasks} enterstep
foo {set a idle} enterstep
foo {set a idle} 0 idle leavestep








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2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056

    update
    after idle {set a "idle"}
    foo

    trace remove execution foo {enter enterstep leavestep leave} \
        [list traceExecute foo]
    rename foo {}
    unset -nocomplain a
    join $info "\n"
} {foo foo enter
foo {set a 1} enterstep
foo {set a 1} 0 1 leavestep
foo {update idletasks} enterstep
foo {set a idle} enterstep
foo {set a idle} 0 idle leavestep
︙︙
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642

catch {rename foo {}}
catch {rename bar {}}
catch {rename untraced {}}
catch {rename traceproc {}}
catch {rename runbase {}}

# Unset the variable when done
catch {unset info}
catch {unset base}

# cleanup
::tcltest::cleanupTests
return








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2631
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2634
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catch {rename foo {}}
catch {rename bar {}}
catch {rename untraced {}}
catch {rename traceproc {}}
catch {rename runbase {}}

# Unset the variable when done
unset -nocomplain info base


# cleanup
cleanupTests
return

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