Merge pull request #3327 from xixixao/forexpansion

Fix expansion in destructuring inside comprehensions

Author: jashkenas

lib/coffee-script/nodes.js

@@ -1914,7 +1914,7 @@ exports.For = class For extends While
     @returns  = no if lastJumps and lastJumps instanceof Return
     source    = if @range then @source.base else @source
     scope     = o.scope
-    name      = @name  and (@name.compile o, LEVEL_LIST)
+    name      = @name  and (@name.compile o, LEVEL_LIST) if not @pattern
     index     = @index and (@index.compile o, LEVEL_LIST)
     scope.find(name)  if name and not @pattern
     scope.find(index) if index

src/nodes.coffee

@@ -537,7 +537,10 @@ test "#2525, #1187, #1208, #1758, looping over an array backwards", ->
 
   arrayEq (index for i, index in list by ident(-1) * 2), [4, 2, 0]
 
+test "splats in destructuring in comprehensions", ->
+  list = [[0, 1, 2], [2, 3, 4], [4, 5, 6]]
+  arrayEq (seq for [rep, seq...] in list), [[1, 2], [3, 4], [5, 6]]
 
-
-
-
+test "#156: expansion in destructuring in comprehensions", ->
+  list = [[0, 1, 2], [2, 3, 4], [4, 5, 6]]
+  arrayEq (last for [..., last] in list), [2, 4, 6]