Macro stdext::try_match

macro_rules! try_match {
    ($var:expr, $variant:path) => { ... };
}

Attempts to get variant from the enum variable.

Examples

#[derive(Debug, PartialEq)]
enum Foo {
    Left(u16),
    Right(&'static str),
}

assert_eq!(try_match!(Foo::Left(18), Foo::Left), Ok(18));
assert_eq!(
    try_match!(Foo::Right("nope"), Foo::Left),
    Err(Foo::Right("nope"))
);