error: expected identifier, found keyword `self`
  --> $DIR/bad-signatures.rs:6:23
   |
LL |     async fn bar(&abc self);
   |                       ^^^^ expected identifier, found keyword

error: expected one of `:`, `@`, or `|`, found keyword `self`
  --> $DIR/bad-signatures.rs:6:23
   |
LL |     async fn bar(&abc self);
   |                  -----^^^^
   |                  |    |
   |                  |    expected one of `:`, `@`, or `|`
   |                  help: declare the type after the parameter binding: `<identifier>: <type>`

error: aborting due to 2 previous errors