1 files changed, 15 insertions, 0 deletions
diff --git a/ext/-test-/string/fstring.c b/ext/-test-/string/fstring.c
new file mode 100644
index 0000000000..b65c98ce6d
--- /dev/null
+++ b/ext/-test-/string/fstring.c
@@ -0,0 +1,15 @@
+#include "ruby.h"
+
+VALUE rb_fstring(VALUE str);
+
+VALUE
+bug_s_fstring(VALUE self, VALUE str)
+{
+    return rb_fstring(str);
+}
+
+void
+Init_fstring(VALUE klass)
+{
+    rb_define_singleton_method(klass, "fstring", bug_s_fstring, 1);
+}