Allow @cast failures to get optimized away

We have the saved_conversion_error field, but I wasn't using it.  Now
@cast errors are saved in that field, so they're only seen if the
optimizer doesn't remove the @cast.

1 files changed, 6 insertions, 0 deletions

diff --git a/testsuite/semok/cast.stp b/testsuite/semok/cast.stp
index 769335f2..14401886 100755
--- a/testsuite/semok/cast.stp
+++ b/testsuite/semok/cast.stp
@@ -14,4 +14,10 @@ probe begin {
     // check modules generated from headers
     println(@cast(0, "task_struct", "kernel<linux/sched.h>")->tgid)
     println(@cast(0, "timeval", "<sys/time.h>")->tv_sec)
+
+    // make sure that bogus @casts can get optimized away
+    @cast(0, "task_struct")->no_such_field
+    @cast(0, "task_struct")->parent->no_such_field
+    @cast(0, "no_such_type")->tgid
+    @cast(0, "task_struct", "no_such_module")->tgid
 }