Stop variable from disappearing by accident when referred to by name. [74b6110204]

Author: dkfellows

generic/tclOOBasic.c

@@ -826,6 +826,11 @@ TclOO_Object_VarName(
 	return TCL_ERROR;
     }
 
+    /*
+     * The variable reference must not disappear too soon. [Bug 74b6110204]
+     */
+    TclSetVarNamespaceVar(varPtr);
+
     /*
      * Now that we've pinned down what variable we're really talking about
      * (including traversing variable links), convert back to a name.

tests/oo.test

@@ -3055,6 +3055,20 @@ test oo-19.3 {OO: varname method and variable decl: Bug 3603695} -setup {
 } -cleanup {
     testClass destroy
 } -result 0
+test oo-19.4 {OO: varname ghosts [Bug 74b6110204]} -setup {
+    oo::class create testClass {
+	export varname
+	self export createWithNamespace
+    }
+    set obj [testClass createWithNamespace testoo19_4 testoo19_4]
+    set ns [info object namespace $obj]
+} -body {
+    set v [$obj varname foo]
+    list [namespace which -variable $v] \
+	[info exists $v] [namespace which -variable $v]
+} -cleanup {
+    testClass destroy
+} -result {::testoo19_4::foo 0 ::testoo19_4::foo}
 
 test oo-20.1 {OO: variable method} -body {
     oo::class create testClass {