// issue 0134 — a same-name `error` set collapses into a namespaced import's
// set (error sets lack per-decl nominal identity).
//
// `EventErr` is declared locally as `error { Boom }`, but
// `#import "modules/std.sx"` also carries `event.EventErr` (an error set with
// tags Init/Register/Wait). Because error-set DECLARATIONS are not given
// per-decl nominal identity (unlike struct/enum/union under E6a) —
// `registerErrorSetDecl` registers via the flat `findByName`-dedup path — the
// local `EventErr` collapses into the imported one, losing its own `Boom` tag.
//
// So `raise error.Boom` / `r == error.Boom` are checked against the IMPORTED
// set, which has no `Boom`.
//
// EXPECT (today): build FAILS —
//   error: error tag 'error.Boom' is not in error set 'EventErr'
// EXPECT (after fix): prints `own EventErr.Boom`, exit 0.
//
// Proof it's the collision: rename `EventErr` -> `MyErr` and it compiles and
// prints. The reference side (`!EventErr` → resolveNominalLeaf) is already
// visibility-aware from issue 0132's broader fix, but it is dormant until the
// local declaration gets its own TypeId. See the .md.

#import "modules/std.sx";

EventErr :: error { Boom }

fail :: () -> !EventErr {
    raise error.Boom;
}

main :: () -> i32 {
    r := fail();
    if r == error.Boom {
        print("own EventErr.Boom\n");
        return 0;
    }
    print("wrong set\n");
    return 1;
}