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-rw-r--r--src/nvim/eval/typval.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nvim/eval/typval.c b/src/nvim/eval/typval.c
index d5db15afcc..e47403c656 100644
--- a/src/nvim/eval/typval.c
+++ b/src/nvim/eval/typval.c
@@ -648,7 +648,7 @@ tv_list_copy_error:
///
/// @return OK or FAIL
int tv_list_flatten(list_T *list, long maxdepth)
- FUNC_ATTR_WARN_UNUSED_RESULT
+ FUNC_ATTR_NONNULL_ARG(1) FUNC_ATTR_WARN_UNUSED_RESULT
{
listitem_T *item;
listitem_T *to_free;