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[para] Side note: This facility requires the use of a tclsh supporting
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the builtin [cmd {info frame}] command. If critcl is run by a tclsh
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not supporting this no [term #line] directives will be emitted. The
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command is supported by Tcl 8.5 and higher. It is also supported by
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Tcl 8.4 provided that it was compiled with the define
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[option -DTCL_TIP280]. An example of such is ActiveState's ActiveTcl.