type SAlias = string

type CAlias = char
type IAlias = int
type UAlias = u32
type FAlias = f32

fn main() {
    // should be errors:
    _ := u8('hello')
    _ := u8(SAlias('hello'))

    // should be allowed:
    _ := u8(char(1))
    _ := u8(int(1))
    _ := u8(u32(1))
    _ := u8(f32(1.0))

    _ := u8(CAlias(1))
    _ := u8(IAlias(1))
    _ := u8(UAlias(1))
    _ := u8(FAlias(1))
}