fix corner cases in join_vars (#3787)

fixes #3786 fixes #3788
2020-04-17 14:19:18 +01:00
parent 9110fac9a2
commit 15a3ebd467
4 changed files with 667 additions and 601 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2365,8 +2365,9 @@ merge(Compressor.prototype, {
                if (expr.operator != "=") break;
                var lhs = expr.left;
                if (!(lhs instanceof AST_SymbolRef)) break;
+                if (is_undeclared_ref(lhs)) break;
                var def = lhs.definition();
-                if (def.scope !== scope) break;
+                if (def.scope !== definitions[0].name.scope) break;
                var name = make_node(AST_SymbolVar, lhs, lhs);
                definitions.push(make_node(AST_VarDef, expr, {
                    name: name,