[GR-31156] Enable argument forwarding with leading arguments

PullRequest: truffleruby/2699

Author: Nicolas Laurent

spec/ruby/language/delegation_spec.rb

@@ -39,3 +39,30 @@ def delegate(...)
     end
   end
 end
+
+ruby_version_is "2.7.3" do
+  describe "delegation with def(x, ...)" do
+    it "delegates rest and kwargs" do
+      a = Class.new(DelegationSpecs::Target)
+      a.class_eval(<<-RUBY)
+        def delegate(x, ...)
+          target(...)
+        end
+      RUBY
+
+      a.new.delegate(0, 1, b: 2).should == [[1], {b: 2}]
+    end
+
+    it "delegates block" do
+      a = Class.new(DelegationSpecs::Target)
+      a.class_eval(<<-RUBY)
+        def delegate_block(x, ...)
+          target_block(...)
+        end
+      RUBY
+
+      a.new.delegate_block(0, 1, b: 2) { |x| x }.should == [{b: 2}, [1]]
+    end
+
+  end
+end