fix corner case in `--reduce-test` (#4625)

diff --git a/test/reduce.js b/test/reduce.js
index 5f192ac..bfc0c17 100644 (file)
--- a/test/reduce.js
+++ b/test/reduce.js
@@ -131,6 +131,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
               case "delete":
                 return;
             }
+            if (parent instanceof U.AST_VarDef && parent.name === node) return;
             // preserve for (var xxx; ...)
             if (parent instanceof U.AST_For && parent.init === node && node instanceof U.AST_Definitions) return node;
             // preserve for (xxx in ...)