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-rw-r--r--include/ruby/intern.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index dae61a7812..50451f35b3 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -691,6 +691,7 @@ long rb_str_sublen(VALUE, long);
VALUE rb_str_substr(VALUE, long, long);
VALUE rb_str_subseq(VALUE, long, long);
void rb_str_modify(VALUE);
+void rb_str_modify_expand(VALUE, long);
VALUE rb_str_freeze(VALUE);
void rb_str_set_len(VALUE, long);
VALUE rb_str_resize(VALUE, long);