Re: [PATCH v3 06/16] qapi/expr.py: Check type of 'data' member

[Markus Armbruster <armbru@redhat.com>]

John Snow <jsnow@redhat.com> writes:

> Iterating over the members of data isn't going to work if it's not some
> form of dict anyway, but for the sake of mypy, formalize it.
>
> Signed-off-by: John Snow <jsnow@redhat.com>
> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
>  scripts/qapi/expr.py | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
> index c97e8ce8a4d..afa6bd07769 100644
> --- a/scripts/qapi/expr.py
> +++ b/scripts/qapi/expr.py
> @@ -254,6 +254,9 @@ def check_union(expr, info):
>              raise QAPISemError(info, "'discriminator' requires 'base'")
>          check_name_is_str(discriminator, info, "'discriminator'")
>  
> +    if not isinstance(members, dict):
> +        raise QAPISemError(info, "'data' must be an object")
> +
>      for (key, value) in members.items():
>          source = "'data' member '%s'" % key
>          check_name_str(key, info, source)
> @@ -267,6 +270,10 @@ def check_alternate(expr, info):
>  
>      if not members:
>          raise QAPISemError(info, "'data' must not be empty")
> +
> +    if not isinstance(members, dict):
> +        raise QAPISemError(info, "'data' must be an object")
> +
>      for (key, value) in members.items():
>          source = "'data' member '%s'" % key
>          check_name_str(key, info, source)

All errors require a negative test.

If an error is unreachable, it should be an assertion instead.

If these new errors are reachable, the commit might be a bug fix.