error: Failed to generate pretend implementation
 --> $DIR/generics.rs:5:1
  |
5 | #[pretend]
  | ^^^^^^^^^^
  |
  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: Generics are not supported
 --> $DIR/generics.rs:8:20
  |
8 |     async fn test_1<T>(&self) -> Result<()>;
  |                    ^^^

error: Generics are not supported
  --> $DIR/generics.rs:11:5
   |
11 | /     where
12 | |         Self: Sized;
   | |___________________^