:   '''[info] errorstack'''
This subcommand of [info] returns the '''-errorstack''' field from the [return%|%option dictionary] trapped at the last [catch] or [try].




** errorstack for Tcl 8.5 **

[HaO] 2012-09-07 As errorstack is a tcl 8.6 extension, one may simulate it with the following code for tcl 8.5.
I got this code from [Alexandre Ferrieux] on clt and it is far to complex for me.
Alexandre has also fixed the bug which prevents using this code for before tcl 8.5.9.

======
if {[package vsatisfies [info patchlevel] 8.5.10-8.6]} {
    set ::errorLevel -1
    set ::errorStack {}
    
    trace add variable ::errorInfo write {
        set __n [info level]
        if {![regexp {\n    invoked from within\n} $::errorInfo]} {
            set ::errorLevel -1;
            set ::errorStack [list];
        }        
        if {($__n > 0) && ($__n != $::errorLevel)} {
            set ::errorLevel $__n
            set __l [info level 0]
            lappend ::errorStack $__l
        }
        list
    }
}
======


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