Why doesn't rust warn about this missing match / typo?

[jofas]

See e.g. this previous topic:

This match feature is awful

I don't know the name of this feature, but it allows you to use any name instead of a case, it's like a worse _ =>. The problem is that this feature allows the introduction of silent bugs, causing typos when comparing constants to go unnoticed, which has happened to me a few times when writing FFI code. Is there any way to force an error in these cases without using #![deny(unused_variables)], which is extremely broad? Something like #![deny(unused_variables_in_match_arms)] would be ideal. Edi…