fix corner case in reduce_vars (#3895)

fixes #3894
2020-05-13 16:44:54 +01:00
parent 30ed8f5580
commit fe2f1965d6
2 changed files with 33 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -741,6 +741,11 @@ merge(Compressor.prototype, {
                            if (j < 0) return value;
                            return iife.args[j] || make_node(AST_Undefined, iife);
                        };
+                        d.fixed.reduce_arg = function() {
+                            var j = fn.argnames.indexOf(arg);
+                            if (j < 0 || j >= iife.args.length) return;
+                            iife.args[j] = make_node(AST_Number, iife.args[j], { value: 0 });
+                        };
                        tw.loop_ids[d.id] = tw.in_loop;
                        mark(tw, d, true);
                    } else {
@@ -7566,6 +7571,7 @@ merge(Compressor.prototype, {
                    }));
                } else {
                    value = fixed.optimize(compressor);
+                    if (def.fixed.reduce_arg) def.fixed.reduce_arg();
                }
                def.replaced++;
                return value;