Argument forwarding with `...` now supports leading arguments.

```ruby
def method_missing(meth, ...)
  send(:"do_#{meth}", ...)
end
```

1 files changed, 19 insertions, 0 deletions

diff --git a/test/t/syntax.rb b/test/t/syntax.rb
index ae698c385..3b6de6c18 100644
--- a/test/t/syntax.rb
+++ b/test/t/syntax.rb
@@ -686,3 +686,22 @@ assert('_0 is not numbered parameter') do
   _0 = :l
   assert_equal(:l, ->{_0}.call)
 end
+
+assert('argument forwarding') do
+  c = Class.new {
+    def a0(*a,&b)
+      assert_equal([1,2,3], a)
+      assert_not_nil(b)
+    end
+    def a(...)
+      a0(...)
+    end
+    def b(a,...)
+      assert_equal(a,1)
+      a0(1,...)
+    end
+  }
+  o = c.new
+  o.a(1,2,3){}
+  o.b(1,2,3){}
+end