Macro unreachable_2015
macro unreachable_2015 {
() => { ... },
($msg:expr $(,)?) => { ... },
($fmt:expr, $($arg:tt)*) => { ... },
}unreachable_2015macro unreachable_2015 {
() => { ... },
($msg:expr $(,)?) => { ... },
($fmt:expr, $($arg:tt)*) => { ... },
}