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qapi/schema: fix typing for QAPISchemaVariants.tag_member
There are two related changes here: (1) We need to perform type narrowing for resolving the type of tag_member during check(), and (2) tag_member is a delayed initialization field, but we can hide it behind a property that raises an Exception if it's called too early. This simplifies the typing in quite a few places and avoids needing to assert that the "tag_member is not None" at a dozen callsites, which can be confusing and suggest the wrong thing to a drive-by contributor. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-ID: <20240315152301.3621858-18-armbru@redhat.com>
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