rb_id_serial_to_id: return unregistered ID as an internal ID

```ruby
def foo(*); ->{ super }; end
```

This code makes anonymous parameters which is not registered as an
ID.  The problem is that when Ractors try to scan `getlocal`
instructions, it puts the Symbol corresponding to the parameter
in to a hash.  Since it is not registered, we end up with a
strange exception.  This commit wraps the unregistered ID in an
internal ID so that we get the same exception for `...` as `*`.

Co-Authored-By: Aaron Patterson <tenderlove@ruby-lang.org>
Co-Authored-By: John Hawthorn <john@hawthorn.email>

bootstraptest/test_ractor.rb

@@ -1502,4 +1502,40 @@ assert_equal "ok", %q{
   "ok"
 }
 
+assert_equal "ok", %q{
+  def foo(*); ->{ super }; end
+  begin
+    Ractor.make_shareable(foo)
+  rescue Ractor::IsolationError
+    "ok"
+  end
+}
+
+assert_equal "ok", %q{
+  def foo(**); ->{ super }; end
+  begin
+    Ractor.make_shareable(foo)
+  rescue Ractor::IsolationError
+    "ok"
+  end
+}
+
+assert_equal "ok", %q{
+  def foo(...); ->{ super }; end
+  begin
+    Ractor.make_shareable(foo)
+  rescue Ractor::IsolationError
+    "ok"
+  end
+}
+
+assert_equal "ok", %q{
+  def foo((x), (y)); ->{ super }; end
+  begin
+    Ractor.make_shareable(foo([], []))
+  rescue Ractor::IsolationError
+    "ok"
+  end
+}
+
 end # if !ENV['GITHUB_WORKFLOW']

symbol.c

@@ -486,7 +486,8 @@ rb_id_serial_to_id(rb_id_serial_t num)
 {
     if (is_notop_id((ID)num)) {
         VALUE sym = get_id_serial_entry(num, 0, ID_ENTRY_SYM);
-	return SYM2ID(sym);
+	if (sym) return SYM2ID(sym);
+	return ((ID)num << ID_SCOPE_SHIFT) | ID_INTERNAL | ID_STATIC_SYM;
     }
     else {
 	return (ID)num;

test/ruby/test_iseq.rb

@@ -95,6 +95,26 @@ class TestISeq < Test::Unit::TestCase
     assert_equal(42, ISeq.load_from_binary(iseq.to_binary).eval)
   end
 
+  def test_super_with_block
+    iseq = compile(<<~EOF)
+      def touch(*) # :nodoc:
+        foo { super }
+      end
+      42
+    EOF
+    assert_equal(42, ISeq.load_from_binary(iseq.to_binary).eval)
+  end
+
+  def test_super_with_block_and_kwrest
+    iseq = compile(<<~EOF)
+      def touch(**) # :nodoc:
+        foo { super }
+      end
+      42
+    EOF
+    assert_equal(42, ISeq.load_from_binary(iseq.to_binary).eval)
+  end
+
   def test_lambda_with_ractor_roundtrip
     iseq = compile(<<~EOF)
       x = 42
@@ -340,6 +360,14 @@ class TestISeq < Test::Unit::TestCase
     end
   end
 
+  def anon_star(*); end
+
+  def test_anon_param_in_disasm
+    iseq = RubyVM::InstructionSequence.of(method(:anon_star))
+    param_names = iseq.to_a[iseq.to_a.index(:method) + 1]
+    assert_equal [2], param_names
+  end
+
   def strip_lineno(source)
     source.gsub(/^.*?: /, "")
   end