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-rw-r--r--internal/string.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/string.h b/internal/string.h
index 50561924f2..d6fea62061 100644
--- a/internal/string.h
+++ b/internal/string.h
@@ -30,6 +30,7 @@ enum ruby_rstring_private_flags {
#endif
/* string.c */
+VALUE rb_str_dup_m(VALUE str);
VALUE rb_fstring(VALUE);
VALUE rb_fstring_cstr(const char *str);
VALUE rb_fstring_enc_new(const char *ptr, long len, rb_encoding *enc);