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-rw-r--r--include/ruby/st.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/st.h b/include/ruby/st.h
index 9ccd03afd3..412a0129c7 100644
--- a/include/ruby/st.h
+++ b/include/ruby/st.h
@@ -107,6 +107,7 @@ int st_numcmp(st_data_t, st_data_t);
st_index_t st_numhash(st_data_t);
int st_strcasecmp(const char *s1, const char *s2);
int st_strncasecmp(const char *s1, const char *s2, size_t n);
+size_t st_memsize(const st_table *);
#if defined(__cplusplus)
#if 0