Re: [PATCH v2 4/8] qapi/error: Change assertion

[John Snow <jsnow@redhat.com>]

On 3/30/21 1:18 PM, John Snow wrote:

Realizing now that this commit topic is wrong :)

A prior version modified the assertion, I decided it was less churn to 
simply add one.

I think ideally we'd have no assertions here and we'd rely on the type 
hints, but I don't think I can prove that this is safe until after part 
6, so I did this for now instead.

> Eventually, we'll be able to prove that 'info.line' must be an int and
> is never None at static analysis time, and this assert can go
> away. Until then, it's a type error to assume that self.info is not
> None.
> 
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>   scripts/qapi/error.py | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/scripts/qapi/error.py b/scripts/qapi/error.py
> index d179a3bd0c..d0bc7af6e7 100644
> --- a/scripts/qapi/error.py
> +++ b/scripts/qapi/error.py
> @@ -25,6 +25,7 @@ def __init__(self, info, msg, col=None):
>           self.col = col
>   
>       def __str__(self):
> +        assert self.info is not None
>           loc = str(self.info)
>           if self.col is not None:
>               assert self.info.line is not None
>