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-rw-r--r--generic/tclStringRep.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/generic/tclStringRep.h b/generic/tclStringRep.h
index 1ef1957..fc5a713 100644
--- a/generic/tclStringRep.h
+++ b/generic/tclStringRep.h
@@ -86,6 +86,7 @@ typedef struct {
#define GET_STRING(objPtr) \
((String *) (objPtr)->internalRep.twoPtrValue.ptr1)
#define SET_STRING(objPtr, stringPtr) \
+ ((objPtr)->internalRep.twoPtrValue.ptr2 = NULL), \
((objPtr)->internalRep.twoPtrValue.ptr1 = (void *) (stringPtr))
/*