Fix not complete type alias in pattern

[A4-Tacks]

Example

enum Enum<T> {
    Unit,
    Tuple(T),
}

type EnumAlias<T> = Enum<T>;

fn f(x: EnumAlias<u8>) {
    match x {
        $0 => (),
        _ => (),
    }

}

Before this PR

en Enum
bn Enum::Tuple(…) Enum::Tuple($1)$0
bn Enum::Unit          Enum::Unit$0
kw mut
kw ref

After this PR

en Enum
ta EnumAlias
bn Enum::Tuple(…) Enum::Tuple($1)$0
bn Enum::Unit          Enum::Unit$0
kw mut
kw ref