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-rw-r--r--lib.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib.c b/lib.c
index e82311b1..11fd488a 100644
--- a/lib.c
+++ b/lib.c
@@ -397,6 +397,9 @@ val none_satisfy(val list, val pred, val key)
val flatten(val list)
{
+ if (list == nil)
+ return nil;
+
if (atom(list))
return cons(list, nil);