From 26dcf025f4d3d74e49d79ab0eb8ee1d1dd9c1af3 Mon Sep 17 00:00:00 2001
From: xixixao <xixixao@seznam.cz>
Date: Wed, 22 Jan 2014 13:18:50 +0000
Subject: [PATCH] Remove in empty array optimization

---
 lib/coffee-script/nodes.js | 5 +----
 src/nodes.coffee           | 3 +--
 test/operators.coffee      | 4 ++++
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/coffee-script/nodes.js b/lib/coffee-script/nodes.js
index 99b01ca9..7974be3d 100644
--- a/lib/coffee-script/nodes.js
+++ b/lib/coffee-script/nodes.js
@@ -2409,7 +2409,7 @@
 
     In.prototype.compileNode = function(o) {
       var hasSplat, obj, _i, _len, _ref2;
-      if (this.array instanceof Value && this.array.isArray()) {
+      if (this.array instanceof Value && this.array.isArray() && this.array.base.objects.length) {
         _ref2 = this.array.base.objects;
         for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
           obj = _ref2[_i];
@@ -2428,9 +2428,6 @@
 
     In.prototype.compileOrTest = function(o) {
       var cmp, cnj, i, item, ref, sub, tests, _i, _len, _ref2, _ref3, _ref4;
-      if (this.array.base.objects.length === 0) {
-        return [this.makeCode("" + (!!this.negated))];
-      }
       _ref2 = this.object.cache(o, LEVEL_OP), sub = _ref2[0], ref = _ref2[1];
       _ref3 = this.negated ? [' !== ', ' && '] : [' === ', ' || '], cmp = _ref3[0], cnj = _ref3[1];
       tests = [];
diff --git a/src/nodes.coffee b/src/nodes.coffee
index 30249286..b87e10c5 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -1719,7 +1719,7 @@ exports.In = class In extends Base
   invert: NEGATE
 
   compileNode: (o) ->
-    if @array instanceof Value and @array.isArray()
+    if @array instanceof Value and @array.isArray() and @array.base.objects.length
       for obj in @array.base.objects when obj instanceof Splat
         hasSplat = yes
         break
@@ -1728,7 +1728,6 @@ exports.In = class In extends Base
     @compileLoopTest o
 
   compileOrTest: (o) ->
-    return [@makeCode("#{!!@negated}")] if @array.base.objects.length is 0
     [sub, ref] = @object.cache o, LEVEL_OP
     [cmp, cnj] = if @negated then [' !== ', ' && '] else [' === ', ' || ']
     tests = []
diff --git a/test/operators.coffee b/test/operators.coffee
index 20dbd47b..0bbdf84b 100644
--- a/test/operators.coffee
+++ b/test/operators.coffee
@@ -218,6 +218,10 @@ test "#1714: lexer bug with raw range `for` followed by `in`", ->
 test "#1099: statically determined `not in []` reporting incorrect result", ->
   ok 0 not in []
 
+test "#1099: make sure expression tested gets evaluted when array is empty", ->
+  a = 0
+  (do -> a = 1) in []
+  eq a, 1
 
 # Chained Comparison