error: expected `+`
 --> $DIR/future-is-nonsense.rs:8:22
  |
8 |     #[future_is[Sync - Send]]
  |                      ^

error: expected square brackets
  --> $DIR/future-is-nonsense.rs:11:16
   |
11 |     #[future_is(Sync)]
   |                ^

error[E0405]: cannot find trait `Nonsense` in this scope
 --> $DIR/future-is-nonsense.rs:5:17
  |
4 | trait Trait {
  |            - help: you might be missing a type parameter: `<Nonsense>`
5 |     #[future_is[Nonsense]]
  |                 ^^^^^^^^ not found in this scope