fix corner case in collapse_vars (#4869)

fixes #4868
2021-04-24 22:16:51 +01:00
parent a2b1b96752
commit a1a212f639
2 changed files with 27 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2563,8 +2563,13 @@ merge(Compressor.prototype, {
                    if (is_lhs_read_only(value, compressor)) return;
                    var referenced = def.references.length - def.replaced;
                    if (referenced < 2) return;
-                    candidate = candidate.clone();
-                    candidate[candidate instanceof AST_Assign ? "right" : "value"] = value;
+                    var expr = candidate.clone();
+                    expr[expr instanceof AST_Assign ? "right" : "value"] = value;
+                    if (candidate.name_index >= 0) {
+                        expr.name_index = candidate.name_index;
+                        expr.arg_index = candidate.arg_index;
+                    }
+                    candidate = expr;
                }
                return value_def = def;
            }