ffi: unknown carray length represented as nil.

* ffi.c (length_carray): Convert the internal representation
of unknown length, which is a -1 of type cnum, into a nil
return value.

1 files changed, 1 insertions, 1 deletions

diff --git a/ffi.c b/ffi.c
index e5f70b3e..75a37ab8 100644
--- a/ffi.c
+++ b/ffi.c
@@ -2397,7 +2397,7 @@ val carray_type(val carray)
 val length_carray(val carray)
 {
   struct carray *scry = carray_struct_checked(carray);
-  return num(scry->nelem);
+  return if3(scry->nelem < 0, nil, num(scry->nelem));
 }
 
 mem_t *carray_get(val carray, val type, val self)