Tcl Source Code

Tcl_GetIndexFromObjStruct doesn't reset prior result
information in the interpreter when generating its
so-called (in the comments) "fancy error message". 
This means that if you've done something that has set a
result before calling it or Tcl_GetIndexFromObj
(including calling Tcl_GetIndexFromObj multiple times
with multiple errors) you get bogus error messages.

In the particular case I noticed this, I have an ObjCmd
that separates out certain option arguments that it
wants and delegates the remaining options to another
ObjCmd.  Here I use the TCL_ERROR vs. TCL_OK result to
determine whether an option was matched within the set
that the first function wants.  It's a little more
maintainable this way (though perhaps slower with all
those error messages being generated) to have the first
function only know about the small subset of options
that it wants.  At any rate, I noticed that when
feeding the command a bunch of options where one wasn't
recognized by either generated an error message with
repeated error messages and other result bits.

See below for suggested patch.

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the specifc bug reported
has been fixed, and I believe
the general issue has been
corrected too.

See 2004-10-06 ChangeLog entry.

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Is this report still valid?

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Seems to be more of a pandemic issue than just this
function.  See bug #533364.  Just thought I should note it
for reference (maybe someone wants to mark this as a
duplicate or make a single bug entry for fixing this on a
global scale).

File Added - 62611: tclIndexObj.c.diff