fixup! Bring stubbing back

Author: pirj

spec/rspec/support/recursive_const_methods_spec.rb

@@ -36,6 +36,7 @@ def to_str
         end
 
         it 'does not blow up on buggy classes that raise weird errors on `to_str`' do
+          allow(Foo::Bar).to receive(:to_str).and_raise("boom!")
           const, _ = recursive_const_defined?('::RSpec::Support::Foo::Bar::VAL')
 
           expect(const).to eq(10)