1 files changed, 9 insertions, 1 deletions
diff --git a/ext/-test-/string/enc_associate.c b/ext/-test-/string/enc_associate.c
index d6614fb298..594d8a43a4 100644
--- a/ext/-test-/string/enc_associate.c
+++ b/ext/-test-/string/enc_associate.c
@@ -7,8 +7,16 @@ bug_str_enc_associate(VALUE str, VALUE enc)
     return rb_enc_associate(str, rb_to_encoding(enc));
 }
 
+VALUE
+bug_str_encoding_index(VALUE self, VALUE str)
+{
+    int idx = rb_enc_get_index(str);
+    return INT2NUM(idx);
+}
+
 void
-Init_enc_associate(VALUE klass)
+Init_string_enc_associate(VALUE klass)
 {
     rb_define_method(klass, "associate_encoding!", bug_str_enc_associate, 1);
+    rb_define_singleton_method(klass, "encoding_index", bug_str_encoding_index, 1);
 }