Tcl Library Source Code

try - Forward compatibility implementation of [throw]
Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2018 Conference, Houston/TX, US, Oct 15-19
Send your abstracts to
or submit via the online form by Aug 20.

[ Main Table Of Contents | Table Of Contents | Keyword Index | Categories | Modules | Applications ]

try(n) 1 tcllib "Forward compatibility implementation of [throw]"


try - throw - Throw an error exception with a message


  • package require Tcl 8.5
  • package require throw ?1?


This package provides a forward-compatibility implementation of Tcl 8.6's throw command (TIP 329), for Tcl 8.5. The code was directly pulled from Tcl 8.6 revision ?, when try/finally was implemented as Tcl procedure instead of in C.

::throw error_code error_message

throw is merely a reordering of the arguments of the error command. It throws an error with the indicated error code and error message.


throw {MYERROR CODE} "My error message"

Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category try of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.

See Also