On Sat, 31 Oct 2020 at 17:49, Paul Sokolovsky <[email protected]> wrote:
> Alternatively, can add "inline guard sigils" for the most common guard
> conditions, which would be equality, period:
>
> match r:
> case (src, None):
> case (==c, msg):
> case (==s, msg):
`==` interacts poorly with other aspects of the pattern syntax (most
notably keywords in class patterns), but PEP 642's identity constraint
expressions would allow:
match r:
case (src, ?is None):
... # Any src, msg is None
case (?is c, msg):
... # Any msg, src is c
case (?is s, msg):
... # Any msg, src is s
Cheers,
Nick.
--
Nick Coghlan | [email protected] | Brisbane, Australia
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