Omit forwarding parameter tests on JRuby

The tests added with the forwarding parameter option call the private
parser entry points with the option enabled, but the WebAssembly parser
shim JRuby loads deliberately rejects it with NotImplementedError
(lib/rbs/wasm/parser.rb), so the JRuby suite has been red since the
option merged.

Omit those tests on JRuby with omit_on_jruby!, as the suite already
does for other C-extension-only paths. The schema check for forwarding
parameters moves to its own test case so the default method type schema
coverage still runs on JRuby.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KscuNdoWHSkZx3iLD2XcbZ

Author: claude

test/rbs/method_type_parsing_test.rb

@@ -83,6 +83,8 @@ def foo: (...) -> void
   end
 
   def test_forwarding_parameter
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
+
     parse_method_type_with_forwarding("(...) -> void").tap do |type|
       assert_equal "(...) -> void", type.to_s
       assert_instance_of Types::Function::ForwardingParam, type.type.forwarding
@@ -100,6 +102,8 @@ def test_forwarding_parameter
   end
 
   def test_forwarding_parameter_with_overload_continuation
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
+
     _, declarations = parse_signature_with_forwarding(<<~RBS)
       class Foo
         def foo: (...) -> void
@@ -113,6 +117,8 @@ def foo: (...) -> void
   end
 
   def test_forwarding_parameter_rejects_nonleading_parameters
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
+
     [
       "(?String value, ...) -> void",
       "(*String values, ...) -> void",
@@ -127,6 +133,8 @@ def test_forwarding_parameter_rejects_nonleading_parameters
   end
 
   def test_forwarding_parameter_must_be_last
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
+
     [
       "(..., String) -> void",
       "(..., ...) -> void",
@@ -139,6 +147,8 @@ def test_forwarding_parameter_must_be_last
   end
 
   def test_forwarding_parameter_cannot_have_explicit_block
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
+
     [
       "(...) { () -> void } -> void",
       "(...) ?{ () -> void } -> void",
@@ -150,6 +160,8 @@ def test_forwarding_parameter_cannot_have_explicit_block
   end
 
   def test_forwarding_parameter_is_not_allowed_in_block_types
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
+
     error = assert_raise(RBS::ParsingError) do
       parse_method_type_with_forwarding("() { (...) -> void } -> void")
     end

test/rbs/schema_test.rb

@@ -120,6 +120,10 @@ def test_method_type_schema
     JSONValidator.method_type.validate!(
       parse_method_type("[G] (A a, ?B, *C, d: D, ?e: E e, **f) ?{ (G) -> void } -> String").to_json
     )
+  end
+
+  def test_method_type_schema_with_forwarding_parameter
+    omit_on_jruby! "The WebAssembly parser does not support forwarding parameter syntax"
 
     # Forwarding parameters are only parsed when explicitly enabled
     source = "(String message, ...) -> void"