fn c(u: MuID) -> MuID {
    if is_precolored(u) {
        backend::get_color_for_precolored(u)
    } else {
        u
    }
}
/// checks if a reg is machine register. If so, return its color
/// otherwise return the reg
checks if a reg is machine register. If so, return its color
otherwise return the reg
checks if a reg is machine register . If so return its color otherwise return the reg
fn c(u: MuID) -> MuID {
    if is_precolored(u) {
        backend::get_color_for_precolored(u)
    } else {
        u
    }
}
fn c ( u : MuID ) -> MuID { if is_precolored ( u ) { backend :: get_color_for_precolored ( u ) } else { u } }
checks if a reg is machine register.
checks if a reg is machine register .
u
MuID
u
MuID