safely preserving the arguments object through generated closure wrappers.

test/test_comprehensions.coffee

@@ -92,3 +92,10 @@ store: (obj) -> result: obj
 store (x * 2 for x in [3, 2, 1])
 
 ok result.join(' ') is '6 4 2'
+
+
+# Closure-wrapped comprehensions that refer to the "arguments" object.
+expr: ->
+  result: item * item for item in arguments
+
+ok expr(2, 4, 8).join(' ') is '4 16 64'