| error: passing `TyCtxt<'tcx>` by reference | 
 |   --> $DIR/rustc_pass_by_value_self.rs:18:15 | 
 |    | | 
 | LL |     fn by_ref(&self) {} | 
 |    |               ^^^^^ help: try passing by value: `TyCtxt<'tcx>` | 
 |    | | 
 | note: the lint level is defined here | 
 |   --> $DIR/rustc_pass_by_value_self.rs:8:9 | 
 |    | | 
 | LL | #![deny(rustc::pass_by_value)] | 
 |    |         ^^^^^^^^^^^^^^^^^^^^ | 
 |  | 
 | error: passing `Ty<'tcx>` by reference | 
 |   --> $DIR/rustc_pass_by_value_self.rs:30:21 | 
 |    | | 
 | LL |     fn by_ref(self: &Ty<'tcx>) {} | 
 |    |                     ^^^^^^^^^ help: try passing by value: `Ty<'tcx>` | 
 |  | 
 | error: passing `Foo` by reference | 
 |   --> $DIR/rustc_pass_by_value_self.rs:37:17 | 
 |    | | 
 | LL |     fn with_ref(&self) {} | 
 |    |                 ^^^^^ help: try passing by value: `Foo` | 
 |  | 
 | error: passing `WithParameters<T, 1>` by reference | 
 |   --> $DIR/rustc_pass_by_value_self.rs:47:17 | 
 |    | | 
 | LL |     fn with_ref(&self) {} | 
 |    |                 ^^^^^ help: try passing by value: `WithParameters<T, 1>` | 
 |  | 
 | error: passing `WithParameters<T, 1, u8>` by reference | 
 |   --> $DIR/rustc_pass_by_value_self.rs:51:17 | 
 |    | | 
 | LL |     fn with_ref(&self) {} | 
 |    |                 ^^^^^ help: try passing by value: `WithParameters<T, 1, u8>` | 
 |  | 
 | error: aborting due to 5 previous errors | 
 |  |