Function __action64

fn __action64(
    cx: &mut ParseCtxt<'_>,
    (_, lo, _): (Location, Location, Location),
    (_, _, _): (Location, Token, Location),
    (_, tys, _): (Location, Punctuated<Ty, Token>, Location),
    (_, _, _): (Location, Token, Location),
    (_, hi, _): (Location, Location, Location),
) -> Ty