//ww:run
package main;
// migrated from test/wcc/929_match_4arm_cross_module_run.c: canonical 4-arm — caller fn `next` shadows callee a.next; every arm body must fire (#31 fnretlookupmod).
package a;
export type more = void;
export type invalid = !void;
export type done = void;
export fn next(k: i32) (rune | done | more | invalid) = {
    if (k == 0) { return 0x41u32: rune; };
    if (k == 1) { let v: done; return v; };
    if (k == 2) { let v: more; return v; };
    let v: invalid; return v;
};
package b;
import a;
type done = void;
fn next(k: i32) i32 = {
    match (a.next(k)) {
    case let r: rune       => return 100i32 + (r: i32);
    case let dn: a.done    => return 200;
    case let m:  a.more    => return 300;
    case let e:  a.invalid => return 400;
    };
};
export fn main() i32 = {
    if (next(0) != 165) { return 11; };
    if (next(1) != 200) { return 12; };
    if (next(2) != 300) { return 13; };
    if (next(3) != 400) { return 14; };
    return 0;
};