Tcl package Thread source code

Observed behavior (reported by Ralf Fassel on comp.lang.tcl):

package require Ttrace
parray tcl_platform
=> "tcl_platform" isn't an array

The reason for the above strange error message is a bug in the Ttrace package.  This package renames the "unknown" proc to ::tcl::unknown and provides its own "unknown" command implementation in the file ttrace.tcl.  Line #329 of this file reads:

            set c [catch {::eval ::tcl::unknown $args} r]

This line (belonging to the body of the ttrace::unknown proc, which in turn is imported into the global namespace) must be changed to become:

            set c [catch {uplevel ::tcl::unknown $args} r]

The bug described above is a very long-standing one.  As far as I can see, it has been present in Ttrace from the very beginning.

Done [d532cbd23f6e357b|here]. Thanks, Schelte, for your suggestion!

I believe it is recommended to always provide an explicit level to the uplevel command. This prevents failing attempts to interpret the first argument as number or #number and is supposedly more efficient. Or so I've been told.

Fixed now in all branches. Will be part of Thread 2.8.8. Thanks for the clear example! And for the fix!