I tried this:
```ruby
            expect_warning_with_call_site(__FILE__, __LINE__ + 2, /Unable to remove stub method foo because the object was frozen./)

```

got this:
```
     Failure/Error: expect {
       expected RSpec::Mocks::MockExpectationError, got #<RSpec::Expectations::ExpectationNotMetError: expected "Unable to remove stub method foo because the object was frozen. Called from /Users/justin/workspace/rspec-mocks/spec/rspec/mocks/matchers/receive_spec.rb:9:in `verify_all'." to match /Called from \/Users\/justin\/workspace\/rspec-mocks\/spec\/rspec\/mocks\/matchers\/receive_spec.rb:225/
       Diff:
       @@ -1,2 +1,2 @@
       -/Called from \/Users\/justin\/workspace\/rspec-mocks\/spec\/rspec\/mocks\/matchers\/receive_spec.rb:225/
       +"Unable to remove stub method foo because the object was frozen. Called from /Users/justin/workspace/rspec-mocks/spec/rspec/mocks/matchers/receive_spec.rb:9:in `verify_all'."
```