// `??` default whose type can't match a 1-tuple optional payload is a clean
// diagnostic, not an LLVM PHI-type crash.
//
// Regression (issue 0180): `?(i32,) ?? 5` built a merge PHI of `{i32}` (the
// unwrapped 1-tuple payload) vs `i32` (the scalar default) and aborted the
// LLVM verifier. There is no implicit scalar->1-tuple coercion (a 1-tuple
// value is written `(5,)`), so the mismatch is now reported at the default.
#import "modules/std.sx";

main :: () {
    o : ?(i32,) = null;
    x := o ?? 5; // default 'i64' vs payload '(i32,)' -> diagnostic
    print("{}\n", x.0);
}