From b47696eecfa455d0c22b3161c1866106329236a3 Mon Sep 17 00:00:00 2001
From: Ingvar Stepanyan <me@rreverser.com>
Date: Sun, 26 Oct 2014 21:03:35 +0200
Subject: [PATCH] Avoid UnaryExpression-specific properties in SpreadElement
 (just in case).

---
 acorn.js | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/acorn.js b/acorn.js
index e6a6e64c0e..adf467542e 100644
--- a/acorn.js
+++ b/acorn.js
@@ -1949,11 +1949,14 @@
 
   function parseMaybeUnary() {
     if (tokType.prefix) {
-      var node = startNode(), update = tokType.isUpdate;
-      var nodeType = tokType === _ellipsis ? "SpreadElement" :
-        (update ? "UpdateExpression" : "UnaryExpression");
-      node.operator = tokVal;
-      node.prefix = true;
+      var node = startNode(), update = tokType.isUpdate, nodeType;
+      if (tokType === _ellipsis) {
+        nodeType = "SpreadElement";
+      } else {
+        nodeType = update ? "UpdateExpression" : "UnaryExpression";
+        node.operator = tokVal;
+        node.prefix = true;
+      }
       tokRegexpAllowed = true;
       next();
       node.argument = parseMaybeUnary();