prog: fix TestSpecialStructs

We should not try to generate/mutate output arguments.
SpecialTypes generators are meant to accept inout arguments.

1 files changed, 3 insertions, 0 deletions

diff --git a/prog/prog_test.go b/prog/prog_test.go
index 5c7cc4664..4d9baff62 100644
--- a/prog/prog_test.go
+++ b/prog/prog_test.go
@@ -183,6 +183,9 @@ func TestSpecialStructs(t *testing.T) {
 				var typ Type
 				for i := 0; i < len(target.Syscalls) && typ == nil; i++ {
 					ForeachType(target.Syscalls[i], func(t Type) {
+						if t.Dir() == DirOut {
+							return
+						}
 						if s, ok := t.(*StructType); ok && s.Name() == special {
 							typ = s
 						}