fix corner case in ie8 & mangle (#3524)

fixes #3523
2019-10-24 23:43:19 +08:00
parent 0f7aa41e33
commit 82b3eed5ef
2 changed files with 387 additions and 1 deletions
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -214,7 +214,13 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
    function redefine(node, scope) {
        var name = node.name;
        var old_def = node.thedef;
-        var new_def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
+        var new_def = scope.find_variable(name);
+        if (new_def) {
+            var redef;
+            while (redef = new_def.redefined()) new_def = redef;
+        } else {
+            new_def = self.globals.get(name) || scope.def_variable(node);
+        }
        old_def.orig.concat(old_def.references).forEach(function(node) {
            node.thedef = new_def;
            node.reference(options);