From 306f02117b81620568548172bfc8ec85e1c653a2 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 3 Oct 2019 07:52:03 +0900
Subject: Refactor `append_gen` function.

---
 mrbgems/mruby-compiler/core/parse.y | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index b2c31ed17..4abe1c506 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -202,12 +202,11 @@ append_gen(parser_state *p, node *a, node *b)
   node *c = a;
 
   if (!a) return b;
+  if (!b) return a;
   while (c->cdr) {
     c = c->cdr;
   }
-  if (b) {
-    c->cdr = b;
-  }
+  c->cdr = b;
   return a;
 }
 #define append(a,b) append_gen(p,(a),(b))
-- 
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