1 files changed, 7 insertions, 0 deletions
diff --git a/ext/-test-/symbol/init.c b/ext/-test-/symbol/init.c
index 3b7cf15899..9e42e1a38b 100644
--- a/ext/-test-/symbol/init.c
+++ b/ext/-test-/symbol/init.c
@@ -8,11 +8,18 @@ sym_find(VALUE dummy, VALUE sym)
     return rb_check_symbol(&sym);
 }
 
+static VALUE
+sym_pinneddown_p(VALUE dummy, VALUE sym)
+{
+    return rb_check_id(&sym) ? Qtrue : Qfalse;
+}
+
 void
 Init_symbol(void)
 {
     VALUE mBug = rb_define_module("Bug");
     VALUE klass = rb_define_class_under(mBug, "Symbol", rb_cSymbol);
     rb_define_singleton_method(klass, "find", sym_find, 1);
+    rb_define_singleton_method(klass, "pinneddown?", sym_pinneddown_p, 1);
     TEST_INIT_FUNCS(init);
 }