check_type() checks the array's contents, then peels off the array and
falls through to the "not array" code without resetting allow_array
and allow_dict to False.  Works because the peeled value is a string,
and allow_array and allow_dict aren't used then.  Tidy up anyway:
recurse instead, defaulting allow_array and allow_dict to False.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190927134639.4284-14-armbru@redhat.com>
---
 scripts/qapi/common.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 111a4bbe55..870d8b0ecb 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -795,7 +795,8 @@ def check_type(value, info, source,
             raise QAPISemError(info,
                                "%s: array type must contain single type name" %
                                source)
-        value = value[0]
+        check_type(value[0], info, source, allow_metas=allow_metas)
+        return
 
     # Check if type name for value is okay
     if isinstance(value, str):
-- 
2.21.0