fix corner case in reduce_vars (#4433)

fixes #4432
2020-12-21 06:03:18 +00:00
parent 47b63ed1a0
commit c319030373
2 changed files with 29 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -912,10 +912,16 @@ merge(Compressor.prototype, {
            init.walk(tw);
            if (init instanceof AST_Definitions) {
                init.definitions[0].name.match_symbol(function(node) {
-                    if (node instanceof AST_SymbolDeclaration) node.definition().fixed = false;
+                    if (node instanceof AST_SymbolDeclaration) {
+                        var def = node.definition();
+                        def.assignments++;
+                        def.fixed = false;
+                    }
                }, true);
-            } else if (init instanceof AST_SymbolRef) {
-                init.definition().fixed = false;
+            } else if (init instanceof AST_SymbolRef && !init.is_immutable()) {
+                var def = init.definition();
+                def.assignments++;
+                def.fixed = false;
            }
            this.body.walk(tw);
            pop(tw);