YJIT: Support empty splat

Previously we rejected empty splat calls to methods with no parameters
as `iseq_arity_error` which didn't work well with delegated calls.

1 files changed, 10 insertions, 0 deletions

diff --git a/test/ruby/test_yjit.rb b/test/ruby/test_yjit.rb
index b0a8337c11..3ccc1be1dd 100644
--- a/test/ruby/test_yjit.rb
+++ b/test/ruby/test_yjit.rb
@@ -1584,6 +1584,16 @@ class TestYJIT < Test::Unit::TestCase
     RUBY
   end
 
+  def test_empty_splat
+    assert_compiles(<<~'RUBY', result: %i[ok ok], no_send_fallbacks: true)
+      def foo = :ok
+      def fw(...) = foo(...)
+      def use(empty) = [foo(*empty), fw]
+
+      use([])
+    RUBY
+  end
+
   private
 
   def code_gc_helpers