//ww:run-exit 42
// #142: a VALUE use of an error-singleton type name whose union has
// structurally identical siblings. The pre-fix wwstage stamped the
// flattened BODY type (!void), so flatvariantidxt could not pick a
// variant and loud-rejected; the per-decl NAMED stamp discriminates.
// Exit 42 proves the SECOND variant is selected, not the first.
package main;

type a = !void;
type b = !void;
type err = !(a | b);

fn f() err = {
	return b;
};

fn main() i32 = {
	match (f()) {
	case a => { return 41; };
	case b => { return 42; };
	};
	return 9;
};