1 files changed, 1 insertions, 0 deletions
diff --git a/unwind.h b/unwind.h
index b08f8dc9..33106a0a 100644
--- a/unwind.h
+++ b/unwind.h
@@ -137,6 +137,7 @@ noreturn val uw_throwfv(val sym, val fmt, struct args *);
 noreturn val uw_errorf(val fmt, ...);
 noreturn val uw_errorfv(val fmt, struct args *args);
 val uw_defer_warning(val args);
+val uw_warning_exists(val tag);
 val uw_dump_deferred_warnings(val stream);
 val uw_release_deferred_warnings(void);
 val uw_purge_deferred_warning(val tag);