fix corner case in collapse_vars (#4917)

fixes #4916
2021-05-07 19:34:27 +01:00
parent ac1f7d689b
commit ee9ceb79ca
2 changed files with 27 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1490,7 +1490,7 @@ merge(Compressor.prototype, {
                lhs = lhs.fixed_value();
            }
            if (!lhs) return true;
-            if (lhs.is_constant()) return true;
+            if (lhs.tail_node().is_constant()) return true;
            return is_lhs_read_only(lhs, compressor);
        }
        if (lhs instanceof AST_SymbolRef) {