macro_rules! enumerated_error {
(
$vis:vis
$err_ty:ident,
$($variant:ident($from_ty:ty)),* $(,)?
) => { ... };
}macro_rules! enumerated_error {
(
$vis:vis
$err_ty:ident,
$($variant:ident($from_ty:ty)),* $(,)?
) => { ... };
}