[PATCH 07/25] qapi/schema.py: constrain tag_member type

[John Snow]

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/schema.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index aaf20f776b..15ff441660 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -546,15 +546,18 @@ def set_defined_in(self, name):
 
     def check(self, schema, seen):
         if not self.tag_member:  # flat union
-            self.tag_member = seen.get(c_name(self._tag_name))
+            tag_member = seen.get(c_name(self._tag_name))
             base = "'base'"
             # Pointing to the base type when not implicit would be
             # nice, but we don't know it here
-            if not self.tag_member or self._tag_name != self.tag_member.name:
+            if not tag_member or self._tag_name != tag_member.name:
                 raise QAPISemError(
                     self.info,
                     "discriminator '%s' is not a member of %s"
                     % (self._tag_name, base))
+
+            assert isinstance(tag_member, QAPISchemaObjectTypeMember)
+            self.tag_member = tag_member
             # Here we do:
             base_type = schema.lookup_type(self.tag_member.defined_in)
             assert base_type
-- 
2.26.2