Suggestion: assert pattern macro.

[norcalli]

macro_rules! assert_pattern {
    ($a:expr => $b:pat) => {
        assert!(match $a { $b => true, _ => false });
    }
}

Something like this would be useful for checking a pattern instead of deriving Eq,PartialEq for an enum.

[alexcrichton]

There's actually a crates on crates.io that does this already! https://crates.io/crates/matches

Right now we're also tracking new feature requests in the RFC repo, so if you feel that it still needs to be included in the stdlib by default, feel free to open an issue!

[alexcrichton]

Er, looks like there's already an issue!

rust-lang/rfcs#264