From b20c9a1b387b6fccef2fcd8fa93306cde1b96c8c Mon Sep 17 00:00:00 2001
From: Lukas Werling <lukas.werling@gmail.com>
Date: Sat, 30 May 2015 22:18:37 +0200
Subject: [PATCH] Allow trailing comma in list literal

---
 src/vm/wren_compiler.c                 | 3 +++
 test/language/list/trailing_comma.wren | 7 +++++++
 2 files changed, 10 insertions(+)
 create mode 100644 test/language/list/trailing_comma.wren

diff --git a/src/vm/wren_compiler.c b/src/vm/wren_compiler.c
index 390c7250..c71dd7ec 100644
--- a/src/vm/wren_compiler.c
+++ b/src/vm/wren_compiler.c
@@ -1816,6 +1816,9 @@ static void list(Compiler* compiler, bool allowAssignment)
     {
       ignoreNewlines(compiler);
 
+      // List with trailing comma.
+      if (peek(compiler) == TOKEN_RIGHT_BRACKET) break;
+
       // Push a copy of the list since the add() call will consume it.
       emit(compiler, CODE_DUP);
 
diff --git a/test/language/list/trailing_comma.wren b/test/language/list/trailing_comma.wren
new file mode 100644
index 00000000..a9995607
--- /dev/null
+++ b/test/language/list/trailing_comma.wren
@@ -0,0 +1,7 @@
+var list = [
+  "a",
+  "b",
+]
+
+IO.print(list[0]) // expect: a
+IO.print(list[1]) // expect: b