From e7ebdce60fadb4349318f14a4409d1a077a63ebf Mon Sep 17 00:00:00 2001
From: Michal Srb <ms6611@imperial.ac.uk>
Date: Tue, 23 Apr 2013 05:42:37 +0200
Subject: [PATCH] Fix #2953. Method calls on splice endpoints

---
 lib/coffee-script/nodes.js       | 2 +-
 src/nodes.coffee                 | 3 ++-
 test/slicing_and_splicing.coffee | 9 +++++++++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/coffee-script/nodes.js b/lib/coffee-script/nodes.js
index 9f1c17ee..c128fc84 100644
--- a/lib/coffee-script/nodes.js
+++ b/lib/coffee-script/nodes.js
@@ -1746,7 +1746,7 @@
         fromDecl = fromRef = '0';
       }
       if (to) {
-        if ((from != null ? from.isSimpleNumber() : void 0) && to.isSimpleNumber()) {
+        if (from && from instanceof Value && (from != null ? from.isSimpleNumber() : void 0) && to instanceof Value && to.isSimpleNumber()) {
           to = +to.compile(o) - +fromRef;
           if (!exclusive) {
             to += 1;
diff --git a/src/nodes.coffee b/src/nodes.coffee
index fd8bb006..bc6c1098 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -1261,7 +1261,8 @@ exports.Assign = class Assign extends Base
     else
       fromDecl = fromRef = '0'
     if to
-      if from?.isSimpleNumber() and to.isSimpleNumber()
+      if from and from instanceof Value and from?.isSimpleNumber() and
+                    to instanceof Value and to.isSimpleNumber()
         to = +to.compile(o) - +fromRef
         to += 1 unless exclusive
       else
diff --git a/test/slicing_and_splicing.coffee b/test/slicing_and_splicing.coffee
index 5d37d840..a126ec00 100644
--- a/test/slicing_and_splicing.coffee
+++ b/test/slicing_and_splicing.coffee
@@ -144,3 +144,12 @@ test "#1723: operator precedence in unbounded splice compilation", ->
   list = [0..9]
   list[..if n then n else 0] = n
   arrayEq [n..9], list
+
+test "#2953: methods on endpoints in assignment from array splice literal", ->
+  list = [0..9]
+
+  Number.prototype.same = -> this
+  list[1.same()...9.same()] = 5
+  delete Number.prototype.same
+
+  arrayEq [0, 5, 9], list