015 catchall on effect tor refused

// Test 355_015: FRONTEND_COMPILE_ERROR — `|?` under an effect-only tor refuses.
//
// The spelling is judged before the callee's shape is: `|?` is not an
// arm no matter what the dispatch sits under. Here the effect arms are
// legitimate; the terminal catch-all line is the refusal.

~tor tokenize { source: string }
! token u32
! ?warn string

~proc tokenize|zig {
    _ = source;
    token(1);
}

~pub tor observe { name: string }
~proc observe|zig {
    _ = name;
}

~tokenize(source: "x")
! token _ |> observe(name: "tok")
|? |> observe(name: "rest")