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-rw-r--r--src/2021/day4/aoc.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/2021/day4/aoc.h b/src/2021/day4/aoc.h
index cd205cd..69a44fb 100644
--- a/src/2021/day4/aoc.h
+++ b/src/2021/day4/aoc.h
@@ -3,4 +3,5 @@
namespace aoc2021 {
-}
+int day4(line_view);
+} // namespace aoc2021