class RSpec::Expectations::LegacyMatcherAdapter::RSpec1

def self.interface_matches?(matcher)

Experimental RBS support (using type sampling data from the type_fusion project). 

def self.interface_matches?: ((RSpec::Matchers::BuiltIn::Include | RSpec::Matchers::BuiltIn::All) matcher) -> false

This signature was generated using 6 samples from 1 application.

for `failure_message` here.
(paired with `failure_message_when_negated`), so we don't check
Note: `failure_message` is part of the RSpec 3 protocol 
def self.interface_matches?(matcher)
  !matcher.respond_to?(:failure_message_when_negated) &&
  matcher.respond_to?(:negative_failure_message)
end