change when module/require are added to sandbox in REPL

gistfile1.diff

diff --git a/src/coffee-script.coffee b/src/coffee-script.coffee
--- a/src/coffee-script.coffee
+++ b/src/coffee-script.coffee
@@ -88,8 +88,7 @@ exports.eval = (code, options = {}) ->
       sandbox[k] = v for own k, v of options.sandbox
   sandbox.__filename = options.filename || 'eval'
   sandbox.__dirname  = path.dirname sandbox.__filename
-  # define module/require only if they chose not to specify their own
-  unless sandbox.module or sandbox.require
+  unless options.sandbox?
     Module = require 'module'
     sandbox.module  = _module  = new Module(options.modulename || 'eval')
     sandbox.require = _require = (path) -> Module._load path, _module

This would unfortunately force us to duplicate the module-/require-generating code (8 lines!) in the REPL function. Though it would be a slightly better behaviour, I don't think it's worth it.