fix corner case in `ie8` (#4232)

fixes #4231

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/scope.js b/lib/scope.js
index 208633d0..80034a54 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -277,6 +277,9 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
     function redefine(node, scope) {
         var name = node.name;
         var old_def = node.thedef;
+        if (!all(old_def.orig, function(sym) {
+            return !(sym instanceof AST_SymbolConst || sym instanceof AST_SymbolLet);
+        })) return;
         var new_def = scope.find_variable(name);
         if (new_def) {
             var redef = new_def.redefined();
@@ -294,7 +297,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
             node.redef = true;
             node.thedef = new_def;
             node.reference(options);
-            if (node instanceof AST_SymbolConst || node instanceof AST_SymbolLet) new_def.orig.push(node);
         });
         if (old_def.lambda) new_def.lambda = true;
         if (new_def.undeclared) self.variables.set(name, new_def);