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-rw-r--r--zix/trie_util.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/zix/trie_util.h b/zix/trie_util.h
index c10f30a..ff125e1 100644
--- a/zix/trie_util.h
+++ b/zix/trie_util.h
@@ -42,7 +42,7 @@ zix_trie_find_key(const uint8_t* const keys, const size_t n, const uint8_t k)
#else
/** Return the index of the first element in `keys` >= `k`, or `n`. */
-static inline size_t
+static inline ZIX_PURE_FUNC size_t
zix_trie_find_key(const uint8_t* const keys, const size_t n, const uint8_t k)
{
size_t first = 0;