qapi: Tighten checking of unions

Previous commits demonstrated that the generator had several
flaws with less-than-perfect unions:
- a simple union that listed the same branch twice (or two variant
names that map to the same C enumerator, including the implicit
MAX sentinel) ended up generating invalid C code
- an anonymous union that listed two branches with the same qtype
ended up generating invalid C code
- the generator crashed on anonymous union attempts to use an
array type
- the generator was silently ignoring a base type for anonymous
unions
- the generator allowed unknown types or nested anonymous unions
as a branch in an anonymous union

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/tests/qapi-schema/alternate-conflict-dict.out b/tests/qapi-schema/alternate-conflict-dict.out
index b9ac945f5a..e69de29bb2 100644
--- a/tests/qapi-schema/alternate-conflict-dict.out
+++ b/tests/qapi-schema/alternate-conflict-dict.out
@@ -1,6 +0,0 @@
-[OrderedDict([('type', 'One'), ('data', OrderedDict([('name', 'str')]))]),
- OrderedDict([('type', 'Two'), ('data', OrderedDict([('value', 'int')]))]),
- OrderedDict([('union', 'MyUnion'), ('discriminator', OrderedDict()), ('data', OrderedDict([('one', 'One'), ('two', 'Two')]))])]
-[{'enum_name': 'MyUnionKind', 'enum_values': None}]
-[OrderedDict([('type', 'One'), ('data', OrderedDict([('name', 'str')]))]),
- OrderedDict([('type', 'Two'), ('data', OrderedDict([('value', 'int')]))])]