procedure Test.0 ():
    let Test.9 : I64 = 3i64;
    let Test.3 : [C I64, C ] = TagId(0) Test.9;
    let Test.6 : U8 = 0i64;
    let Test.7 : U8 = GetTagId Test.3;
    let Test.8 : Int1 = lowlevel Eq Test.6 Test.7;
    if Test.8 then
        let Test.2 : I64 = UnionAtIndex (Id 0) (Index 0) Test.3;
        ret Test.2;
    else
        let Test.5 : I64 = 0i64;
        ret Test.5;