Add caller info to deprecation warning

- See #151

lib/rspec/mocks/message_expectation.rb

@@ -477,8 +477,11 @@ def initialize(error_generator, expectation_ordering, expected_from, message, &i
 
       def and_return(*)
         # no-op
-        # @deprecated Please do not use and_return with negative message expectations.
-        warn "[DEPRECATION] `and_return` with `should_not_receive` is deprecated."
+        # @deprecated and_return is not supported with negative message expectations.
+        RSpec.warn_deprecation <<-MSG
+
+DEPRECATION: `and_return` with `should_not_receive` is deprecated. Called from #{caller(0)[1]}
+MSG
       end
 
       # @private

spec/rspec/mocks/mock_ordering_spec.rb

@@ -98,11 +98,6 @@ module Mocks
         @double.b
         @double.a
       end
-
-      it "warns when should_not_receive is followed by and_return" do
-        @double.should_receive(:warn).with("[DEPRECATION] `and_return` with `should_not_receive` is deprecated.")
-        @double.should_not_receive(:do_something).and_return(1)
-      end
     end
   end
 end

spec/rspec/mocks/mock_spec.rb

@@ -42,11 +42,11 @@ module Mocks
         @double.rspec_verify
       end
 
-      it "passes when not receiving message specified as not to be received with and_return" do
-        # NOTE (DC 2012-05-05) calling `and_return` after `should_not_receive` makes no sense
-        # and should probably be disallowed.
-        @double.should_not_receive(:not_expected).and_return nil
-        @double.rspec_verify
+      it "warns when should_not_receive is followed by and_return" do
+        RSpec.should_receive(:warn_deprecation).
+          with(/`and_return` with `should_not_receive` is deprecated/)
+
+        @double.should_not_receive(:do_something).and_return(1)
       end
 
       it "passes when receiving message specified as not to be received with different args" do