Fix some spec breakage on 2.7 related to keyword arguments

These specs were probably added in the commit to fully
separate keyword arguments after the release of 2.7.0, but
apparently not tested on 2.7 before hand. The enclosing
ruby_version guard for these specs limits them to 2.7.

spec/ruby/language/method_spec.rb

@@ -1363,7 +1363,9 @@ describe "A method" do
 
         h = mock("keyword splat")
         h.should_receive(:to_hash).and_return({a: 1})
-        m(h).should == {}
+        suppress_keyword_warning do
+          m(h).should == {a: 1}
+        end
       end
 
       evaluate <<-ruby do
@@ -1375,28 +1377,34 @@ describe "A method" do
         m(a: 1).should == [nil, {a: 1}]
         m("a" => 1, a: 1).should == [nil, {"a" => 1, a: 1}]
         m({ "a" => 1 }, a: 1).should == [{"a" => 1}, {a: 1}]
-        ->{m({a: 1}, {})}.should raise_error(ArgumentError)
+        suppress_keyword_warning do
+          m({a: 1}, {}).should == [{a: 1}, {}]
+        end
 
         h = {"a" => 1, b: 2}
-        m(h).should == [{"a" => 1, b: 2}, {}]
+        suppress_keyword_warning do
+          m(h).should == [{"a" => 1}, {b: 2}]
+        end
         h.should == {"a" => 1, b: 2}
 
         h = {"a" => 1}
         m(h).first.should == h
 
         h = {}
-        r = m(h)
-        r.first.should == {}
-        r.last.should == {}
+        suppress_keyword_warning do
+          m(h).should == [nil, {}]
+        end
 
         hh = {}
         h = mock("keyword splat empty hash")
-        h.should_not_receive(:to_hash)
-        m(h).should == [{}, {}]
+        h.should_receive(:to_hash).and_return({a: 1})
+        suppress_keyword_warning do
+          m(h).should == [nil, {a: 1}]
+        end
 
         h = mock("keyword splat")
-        h.should_not_receive(:to_hash)
-        m(h).should == [{"a" => 1, a: 2}, {}]
+        h.should_receive(:to_hash).and_return({"a" => 1})
+        m(h).should == [h, {}]
       end
 
       evaluate <<-ruby do
@@ -1412,7 +1420,9 @@ describe "A method" do
         m(a: 1).should == [[], {a: 1}]
         m("a" => 1, a: 1).should == [[], {"a" => 1, a: 1}]
         m({ "a" => 1 }, a: 1).should == [[{"a" => 1}], {a: 1}]
-        m({a: 1}, {}).should == [[{a: 1}, {}], {}]
+        suppress_keyword_warning do
+          m({a: 1}, {}).should == [[{a: 1}], {}]
+        end
         m({a: 1}, {"a" => 1}).should == [[{a: 1}, {"a" => 1}], {}]
 
         bo = BasicObject.new