//ww:error "not a variant"
// 944_variant_chain_b95 isas_amb_reject_notcrash: `is base` on (ali | ali2)
// (both reach base) — must REJECT (not crash) on the ambiguity (#107). BOTH
// stages reject with the diagnostic body, not a signal.
package main;
type base = struct { a: int, b: int };
type ali = base;
type ali2 = ali;
fn f(v: (ali | ali2)) i32 = {
	if (v is base) { return 1; };
	return 0;
};
export fn main() i32 = { return 0; };