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-rw-r--r--internal/compar.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/compar.h b/internal/compar.h
index 9115e4bd63..5eb5e8714e 100644
--- a/internal/compar.h
+++ b/internal/compar.h
@@ -25,5 +25,6 @@
/* compar.c */
VALUE rb_invcmp(VALUE, VALUE);
+NORETURN(void rb_cmperr_reason(VALUE, VALUE, const char*));
#endif /* INTERNAL_COMPAR_H */