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-rw-r--r--internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index df594c171f..ca630ddbec 100644
--- a/internal.h
+++ b/internal.h
@@ -725,6 +725,7 @@ void rb_encdb_declare(const char *name);
void rb_enc_set_base(const char *name, const char *orig);
int rb_enc_set_dummy(int index);
void rb_encdb_set_unicode(int index);
+int rb_data_is_encoding(VALUE obj);
/* enum.c */
VALUE rb_f_send(int argc, VALUE *argv, VALUE recv);