for >3.2 need ruby2_keywords on all methods in the call path

lib/rspec/support/method_signature_verifier.rb

@@ -109,6 +109,7 @@ def has_kw_args_in?(args) # rubocop:disable Metrics/CyclomaticComplexity, Metric
               (args.last.empty? || args.last.keys.any? { |x| x.is_a?(Symbol) })
           end
         end
+        ruby2_keywords(:has_kw_args_in?) if respond_to?(:ruby2_keywords, true)
 
         # Without considering what the last arg is, could it
         # contain keyword arguments?
@@ -309,6 +310,7 @@ def initialize(signature, args=[])
         @min_non_kw_args = @max_non_kw_args = @non_kw_args
         @arbitrary_kw_args = @unlimited_args = false
       end
+      ruby2_keywords(:initialize) if respond_to?(:ruby2_keywords, true)
 
       def with_expectation(expectation) # rubocop:disable Metrics/MethodLength
         return self unless MethodSignatureExpectation === expectation
@@ -459,6 +461,7 @@ def valid_non_kw_args?(*args)
         def has_kw_args_in?(args)
           @signature.has_kw_args_in?(args)
         end
+        ruby2_keywords(:has_kw_args_in?) if respond_to?(:ruby2_keywords, true)
       end
     end
   end