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qapi: Permit omitting all flat union branches

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Absent flat union branches default to the empty struct (since commit
800877bb16 "qapi: allow empty branches in flat unions").  But an
attempt to omit all of them is rejected with "Union 'FOO' has no
branches".  Harmless oddity, but it's easy to avoid, so do that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190913201349.24332-11-armbru@redhat.com>
[Commit message typo fixed]
This commit is contained in:
Markus Armbruster 2019-09-13 22:13:43 +02:00
parent f03255362a
commit 0ced9531f1
8 changed files with 27 additions and 14 deletions
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9
tests/qapi-schema/qapi-schema-test.out
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@ -23,6 +23,15 @@ enum MyEnum
object Empty1
object Empty2
base Empty1
object q_obj_Union-base
member type: EnumOne optional=False
object Union
base q_obj_Union-base
tag type
case value1: q_empty
case value2: q_empty
case value3: q_empty
case value4: q_empty
command user_def_cmd0 Empty2 -> Empty2
gen=True success_response=True boxed=False oob=False preconfig=False
enum QEnumTwo