fix corner case in loops & unused (#4076)

fixes #4075
2020-08-26 10:32:20 +01:00
parent c7a3e09407
commit 93d084a1d1
2 changed files with 25 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4677,7 +4677,9 @@ merge(Compressor.prototype, {
                    sym = sym.expression.tail_node();
                }
                var def = sym.definition();
-                if (!def || def.id in in_use_ids) return;
+                if (!def) return;
+                if (def.scope !== self) return;
+                if (def.id in in_use_ids) return;
                log(sym, "Dropping unused loop variable {name}");
                var value = node.object.drop_side_effect_free(compressor);
                if (!value) return in_list ? List.skip : make_node(AST_EmptyStatement, node);