[Tcl-bugs] [ tcl-Bugs-959052 ] variable name resolution and unset vars

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Bugs item #959052, was opened at 2004-05-23 17:10
Message generated for change (Comment added) made by msofer
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=959052&group_id=10894

Category: 07. Variables
Group: None
Status: Open
>Resolution: Fixed
Priority: 5
Submitted By: miguel sofer (msofer)
>Assigned to: Jeffrey Hobbs (hobbs)
Summary: variable name resolution and unset vars

Initial Comment:
Name resolution for variablesin namespaces sometimes
finds variables that "do not exist" according to [info
vars].

  % namespace eval a upvar x q
  % info vars x
  % namespace eval b set x 1
  1
  % set x
  1
 
  % trace add variable x write {;#}
  % info vars x
  % namespace eval a set x 1
  1
  % set x
  1

  % namespace eval a {trace add variable x write {;#}}
  % set x 0
  0
  % info vars a::x
  % namespace eval a set x 1
  1
  % set x
  0
  % info vars a::x
  ::a::x

The variables which are found contrary to [info vars]
satisfy:
 - they have an entry in their namespace's hash table
 - they are unset, ie (varPtr->flags & VAR_UNDEFINED)
 - they are not namespace variables, ie 
       !(varPtr->flags & VAR_NAMESPACE_VAR)

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>Comment By: miguel sofer (msofer)
Date: 2004-05-23 19:48

Message:
Logged In: YES 
user_id=148712

Attaching a patch, already committed to HEAD. Please review
for itcl compat. Are there any other known users of
Tcl_FindNamespaceVar that may rely on the weird lookup
semantics?

Second Q: should this be backported to 8.4? 8.3?

----------------------------------------------------------------------

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https://sourceforge.net/tracker/?func=detail&atid=110894&aid=959052&group_id=10894