[Tcl-bugs] [ tcl-Feature Requests-572889 ] upvar links do not fire array read trace

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Feature Requests item #572889, was opened at 2002-06-23 17:43
Message generated for change (Comment added) made by dgp
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Don Porter (dgp)
>Assigned to: Joe English (jenglish)
Summary: upvar links do not fire array read trace

Initial Comment:
% set a(foo) 1
1
% trace variable a r {puts a ;#}
%  set a(foo)
a
1
% upvar 0 a(foo) baz
%  set baz
1

I would like to see the trace fire when
I read from baz.

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>Comment By: Don Porter (dgp)
Date: 2003-04-18 02:28

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Joe, you were asking about this on the chat.

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Comment By: Don Porter (dgp)
Date: 2002-06-24 13:09

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Thanks.  If this is to change, it would be a FR/TIP.
Don't feel strong enough about it to do that now,
but I'll shift this over the FR tracker in case
anyone else wants to pick it up.

Note to self: read *all* relevant man pages before
filing bugs...

Workaround seems to be to set traces on both
the source and target of the [upvar].  Works fine,
then, if annoying.

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Comment By: miguel sofer (msofer)
Date: 2002-06-24 12:56

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upvar.n dixit: "If otherVar refers to an element of an
array, then variable traces set for the entire array will
not be invoked when myVar is accessed (but traces on the
particular element will still be invoked). In particular, if
the array is env, then changes made to myVar will not be
passed to subprocesses correctly."

So, is this a bug or a FR? Does it need a TIP? 


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