1 files changed, 30 insertions, 28 deletions

diff --git a/spec/ruby/core/method/parameters_spec.rb b/spec/ruby/core/method/parameters_spec.rb
index 7d2b37fac7..fd88e8dcb8 100644
--- a/spec/ruby/core/method/parameters_spec.rb
+++ b/spec/ruby/core/method/parameters_spec.rb
@@ -22,6 +22,14 @@ describe "Method#parameters" do
       local_is_not_parameter = {}
     end
 
+    ruby_version_is "4.1" do
+      eval <<-RUBY
+        def one_noblock(&nil); end
+      RUBY
+    end
+
+    def forward_parameters(...) end
+
     def underscore_parameters(_, _, _ = 1, *_, _:, _: 2, **_, &_); end
 
     define_method(:one_optional_defined_method) {|x = 1|}
@@ -185,6 +193,13 @@ describe "Method#parameters" do
     m.parameters.should == [[:nokey]]
   end
 
+  ruby_version_is "4.1" do
+    it "returns [[:noblock]] for a method with a single &nil parameter" do
+      m = MethodSpecs::Methods.instance_method(:one_noblock)
+      m.parameters.should == [[:noblock]]
+    end
+  end
+
   it "works with ->(){} as the value of an optional argument" do
     m = MethodSpecs::Methods.instance_method(:one_opt_with_stabby)
     m.parameters.should == [[:opt,:a]]
@@ -231,40 +246,27 @@ describe "Method#parameters" do
     m.method(:handled_via_method_missing).parameters.should == [[:rest]]
   end
 
-  ruby_version_is '3.2' do
-    it "adds rest arg with name * for \"star\" argument" do
-      m = MethodSpecs::Methods.new
-      m.method(:one_unnamed_splat).parameters.should == [[:rest, :*]]
-    end
+  it "adds rest arg with name * for \"star\" argument" do
+    m = MethodSpecs::Methods.new
+    m.method(:one_unnamed_splat).parameters.should == [[:rest, :*]]
+  end
 
-    it "adds keyrest arg with ** as a name for \"double star\" argument" do
-      m = MethodSpecs::Methods.new
-      m.method(:one_unnamed_keyrest).parameters.should == [[:keyrest, :**]]
-    end
+  it "adds keyrest arg with ** as a name for \"double star\" argument" do
+    m = MethodSpecs::Methods.new
+    m.method(:one_unnamed_keyrest).parameters.should == [[:keyrest, :**]]
   end
 
-  ruby_version_is ''...'3.2' do
-    it "adds nameless rest arg for \"star\" argument" do
-      m = MethodSpecs::Methods.new
-      m.method(:one_unnamed_splat).parameters.should == [[:rest]]
+  it "adds block arg with name & for anonymous block argument" do
+    object = Object.new
+    def object.foo(&)
     end
 
-    it "adds nameless keyrest arg for \"double star\" argument" do
-      m = MethodSpecs::Methods.new
-      m.method(:one_unnamed_keyrest).parameters.should == [[:keyrest]]
-    end
+    object.method(:foo).parameters.should == [[:block, :&]]
   end
 
-  ruby_version_is '3.1' do
-    it "adds block arg with name & for anonymous block argument" do
-      object = Object.new
-
-      eval(<<~RUBY).should == [[:block, :&]]
-        def object.foo(&)
-        end
-        object.method(:foo).parameters
-      RUBY
-    end
+  it "returns [:rest, :*], [:keyrest, :**], [:block, :&] for forward parameters operator" do
+    m = MethodSpecs::Methods.new
+    m.method(:forward_parameters).parameters.should == [[:rest, :*], [:keyrest, :**], [:block, :&]]
   end
 
   it "returns the args and block for a splat and block argument" do
@@ -306,7 +308,7 @@ describe "Method#parameters" do
     [
       [[:rest]],
       [[:opt]]
-    ].should include([].method(:pop).parameters)
+    ].should.include?([].method(:pop).parameters)
   end
 
   it "returns [[:req]] for each parameter for core methods with fixed-length argument lists" do