Macro from_transmute

macro_rules! from_transmute {
    { unsafe $a:ty => $b:ty } => { ... };
    { @impl $from:ty => $to:ty } => { ... };
}

🔬This is a nightly-only experimental API. (portable_simd #86656)

Provides implementations of From<$a> for $b and From<$b> for $a that transmutes the value.