@api private Provides the implementation for `be_an_instance_of`. Not intended to be instantiated directly.
@api private @return [String]
# File lib/rspec/matchers/built_in/be_instance_of.rb, line 11 def description "be an instance of #{expected}" end
# File lib/rspec/matchers/built_in/be_instance_of.rb, line 17 def match(expected, actual) actual.instance_of? expected end