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-rw-r--r--src/2017/day9/aoc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/2017/day9/aoc.h b/src/2017/day9/aoc.h
index 7aacc4c..7fb26e7 100644
--- a/src/2017/day9/aoc.h
+++ b/src/2017/day9/aoc.h
@@ -3,4 +3,5 @@
namespace aoc2017 {
+int day9(line_view);
}