Match data type

# A match arm's data name has the case's type (found by check claude, 2026-09-29): 'd' is an int32,
# so not.bit and times.wrap know their width, and 'b' is a uint8, so plus.wrap wraps at 8 bits.
enum E1 { c1: int32, c2: uint8, c3 }
MAIN {
    let 'e' := E1.c1[5];
    match 'e' {
        c1 'd' { std::print.useful[not.bit 'd', " ", 'd' times.wrap 1000000000, newln]; }
        c2 'b' { }
        c3 { }
    }
    let 'f' := E1.c2[250];
    let 'w' := match 'f' { c1 'd' { is 0; } c2 'b' { is to.int64['b' plus.wrap 10]; } c3 { is 1; } };
    std::print.useful['w', newln];
}