Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2019-09-24' into staging

QAPI patches for 2019-09-24

# gpg: Signature made Tue 24 Sep 2019 13:10:36 BST
# gpg: using RSA k

Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2019-09-24' into staging

QAPI patches for 2019-09-24

# gpg: Signature made Tue 24 Sep 2019 13:10:36 BST
# gpg: using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg: issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-qapi-2019-09-24: (37 commits)
qapi: Assert .visit() and .check_clash() run only after .check()
qapi: Fix excessive QAPISchemaEntity.check() recursion
qapi: Fix to .check() empty structs just once
qapi: Delete useless check_exprs() code for simple union kind
qapi: Clean up around check_known_keys()
qapi: Simplify check_keys()
qapi: Normalize 'if' in check_exprs(), like other sugar
qapi: Fix missing 'if' checks in struct, union, alternate 'data'
qapi: Reject blank 'if' conditions in addition to empty ones
qapi: Fix broken discriminator error messages
qapi: Remove null from schema language
qapi: Improve reporting of lexical errors
qapi: Use quotes more consistently in frontend error messages
tests/qapi-schema: Demonstrate suboptimal lexical errors
tests/qapi-schema: Demonstrate insufficient 'if' checking
tests/qapi-schema: Demonstrate broken discriminator errors
tests/qapi-schema: Demonstrate misleading optional tag error
tests/qapi-schema: Delete two redundant tests
tests/qapi-schema: Cover unknown pragma
qapi: Tweak code to match docs/devel/qapi-code-gen.txt
...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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tests/qapi-schema: Demonstrate suboptimal lexical errors

The error message for forgotten quotes around a name shows just the
name's first character, which isn't as nice as it could be. Same for
att

tests/qapi-schema: Demonstrate suboptimal lexical errors

The error message for forgotten quotes around a name shows just the
name's first character, which isn't as nice as it could be. Same for
attempting to use a number.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190914153506.2151-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

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