macro_rules! impl_display_for_single_struct {
($Name: ident, $name: tt $(. $attr: tt)*) => { ... };
($Name: ident) => { ... };
}
macro_rules! impl_display_for_single_struct {
($Name: ident, $name: tt $(. $attr: tt)*) => { ... };
($Name: ident) => { ... };
}