fix AST corruption during inline of simple return (#3056)

fixes #3054
2018-04-06 05:39:07 +08:00
parent b5bab254ce
commit 44116c6d2b
2 changed files with 36 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4576,7 +4576,12 @@ merge(Compressor.prototype, {
        if (compressor.option("inline") && stat instanceof AST_Return) {
            var value = stat.value;
            if (!value || value.is_constant_expression()) {
-                var args = self.args.concat(value || make_node(AST_Undefined, self));
+                if (value) {
+                    value = value.clone(true);
+                } else {
+                    value = make_node(AST_Undefined, self);
+                }
+                var args = self.args.concat(value);
                return make_sequence(self, args).optimize(compressor);
            }
        }