Function __action16

fn __action16(
    cx: &mut ParseCtxt<'_>,
    (_, lo, _): (Location, Location, Location),
    (_, _, _): (Location, Token, Location),
    (_, ident, _): (Location, Ident, Location),
    (_, generics, _): (Location, Generics, Location),
    (_, params, _): (Location, Option<RefineParams>, Location),
    (_, index, _): (Location, Option<RefineParam>, Location),
    (_, _, _): (Location, Token, Location),
    (_, ty, _): (Location, Ty, Location),
    (_, hi, _): (Location, Location, Location),
) -> TyAlias