* generic/tclEvent.c (HandleBgErrors): Make efficient private copy

        * tests/event.test (event-5.3): of the command prefix for the interp's
        background error handling command to avoid panics due to pointers
        to memory invalid after shimmering.  [Bug 1670155]

1 files changed, 18 insertions, 1 deletions

diff --git a/tests/event.test b/tests/event.test
index e2553d6..101a17e 100644
--- a/tests/event.test
+++ b/tests/event.test
@@ -9,7 +9,7 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #
-# RCS: @(#) $Id: event.test,v 1.23 2006/11/27 20:16:03 kennykb Exp $
+# RCS: @(#) $Id: event.test,v 1.24 2007/03/12 19:28:50 dgp Exp $
 
 package require tcltest 2
 namespace import -force ::tcltest::*
@@ -188,6 +188,23 @@ test event-5.2 {Tcl_BackgroundError, HandleBgErrors procedures} {
     rename bgerror {}
     set x
 } {{a simple error}}
+test event-5.3 {HandleBgErrors: [Bug 1670155]} -setup {
+    variable x
+    proc demo args {variable x done}
+    variable target [list [namespace which demo] x]
+    proc trial args {variable target; string length $target}
+    trace add execution demo enter [namespace code trial]
+    variable save [interp bgerror {}]
+    interp bgerror {} $target
+} -body {
+    after 0 {error bar}
+    vwait [namespace which -variable x]
+} -cleanup {
+    interp bgerror {} $save
+    unset x target save
+    rename demo {}
+    rename trial {}
+} -result {}
 
 test event-6.1 {BgErrorDeleteProc procedure} {
     catch {interp delete foo}