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-rw-r--r--generic/tclVar.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/generic/tclVar.c b/generic/tclVar.c
index c23681f..edce98d 100644
--- a/generic/tclVar.c
+++ b/generic/tclVar.c
@@ -16,7 +16,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclVar.c,v 1.160.2.10 2010/07/31 18:10:11 msofer Exp $
+ * RCS: @(#) $Id: tclVar.c,v 1.160.2.11 2010/09/01 19:42:40 andreas_kupries Exp $
*/
#include "tclInt.h"
@@ -1815,8 +1815,10 @@ TclPtrSetVar(
/*
* Invoke any read traces that have been set for the variable if it is
- * requested; this is only done in the core by the INST_LAPPEND_*
- * instructions.
+ * requested. This was done for INST_LAPPEND_* but that was inconsistent
+ * with the non-bc instruction, and would cause failures trying to
+ * lappend to any non-existing ::env var, which is inconsistent with
+ * documented behavior. [Bug #3057639]
*/
if ((flags & TCL_TRACE_READS) && ((varPtr->flags & VAR_TRACED_READ)