Bundler binstubs + standalone problem

broken_session

# With a clean project setup
$ bundle --binstubs --standalone

$ bundle binstubs rspec-core

$ cat bin/rspec
#!/usr/bin/env ruby
#
# This file was generated by Bundler.
#
# The application 'rspec' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require 'pathname'
ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../../Gemfile",
  Pathname.new(__FILE__).realpath)

require 'rubygems'
require 'bundler/setup'

load Gem.bin_path('rspec-core', 'rspec')

$ cat .bundle/config
---
BUNDLE_PATH: bundle
BUNDLE_DISABLE_SHARED_GEMS: '1'

working_session

# With a clean project setup
$ bundle --binstubs --standalone

$ cat bin/rspec
#!/usr/bin/env ruby
#
# This file was generated by Bundler.
#
# The application 'rspec' is installed as part of a gem, and
# this file is here to facilitate running it.
#

$:.unshift File.expand_path '../../bundle', __FILE__

require 'bundler/setup'
load File.expand_path '../../bundle/ruby/2.1.0/gems/rspec-core-3.1.4/exe/rspec', __FILE__

$ cat .bundle/config
---
BUNDLE_PATH: bundle
BUNDLE_BIN: bin
BUNDLE_DISABLE_SHARED_GEMS: '1'