From c03455021593f7ddec24c96b1ca7172844a3d5a5 Mon Sep 17 00:00:00 2001
From: Ingvar Stepanyan <me@rreverser.com>
Date: Wed, 4 Feb 2015 12:57:18 +0200
Subject: [PATCH] Disallow line break between arrow function params and `=>`.

---
 acorn.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/acorn.js b/acorn.js
index 9d11afe5ff..b129ed62e6 100644
--- a/acorn.js
+++ b/acorn.js
@@ -2263,7 +2263,7 @@
     case _name:
       var start = storeCurrentPos();
       var id = parseIdent(tokType !== _name);
-      if (eat(_arrow)) {
+      if (!canInsertSemicolon() && eat(_arrow)) {
         return parseArrowExpression(startNodeAt(start), [id]);
       }
       return id;
@@ -2352,7 +2352,7 @@
       var innerEnd = storeCurrentPos();
       expect(_parenR);
 
-      if (eat(_arrow)) {
+      if (!canInsertSemicolon() && eat(_arrow)) {
         if (innerParenStart) unexpected(innerParenStart);
         return parseArrowExpression(startNodeAt(start), exprList);
       }