error[E0277]: the trait bound `A: Hash` is not satisfied
  --> $DIR/arg_traits_no_hash.rs:7:16
   |
7  | async fn f(_a: A, _cx: &QueryContext) {}
   |                ^ the trait `Hash` is not implemented for `A`
   |
note: required by `HashCheck`
  --> $DIR/macro_support.rs:13:5
   |
13 | /     pub struct HashCheck<T>(pub PhantomData<T>)
14 | |     where
15 | |         T: Hash;
   | |________________^

error[E0277]: the trait bound `A: Hash` is not satisfied
   --> $DIR/arg_traits_no_hash.rs:6:1
    |
6   | #[query]
    | ^^^^^^^^ the trait `Hash` is not implemented for `A`
    |
    = note: required because of the requirements on the impl of `Hash` for `(A,)`
note: required by a bound in `executor`
   --> $DIR/query.rs:608:25
    |
608 |     Params: Stashable + Hash,
    |                         ^^^^ required by this bound in `executor`
    = note: this error originates in the attribute macro `query` (in Nightly builds, run with -Z macro-backtrace for more info)