fix corner case in collapse_vars (#4041)

fixes #4040
2020-08-06 13:30:28 +01:00
parent 9b05494ebc
commit a8e286f7e1
2 changed files with 19 additions and 4 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1549,10 +1549,9 @@ merge(Compressor.prototype, {
                    return lvalues.has(node.name.name) || side_effects && may_modify(node.name);
                }
                var sym = is_lhs(node.left, node);
-                if (!sym) return false;
-                return lvalues.has(sym.name)
-                    || sym instanceof AST_PropAccess
-                    || read_toplevel && compressor.exposed(sym.definition());
+                if (sym instanceof AST_PropAccess) return true;
+                if (!(sym instanceof AST_SymbolRef)) return false;
+                return lvalues.has(sym.name) || read_toplevel && compressor.exposed(sym.definition());
            }

            function extract_args() {