|  | error[E0642]: patterns aren't allowed in functions without bodies | 
|  | --> $DIR/no-patterns-in-args-2.rs:6:11 | 
|  | | | 
|  | LL |     fn f2(&arg: u8); | 
|  | |           ^^^^ pattern not allowed in function without body | 
|  |  | 
|  | error: patterns aren't allowed in functions without bodies | 
|  | --> $DIR/no-patterns-in-args-2.rs:4:11 | 
|  | | | 
|  | LL |     fn f1(mut arg: u8); | 
|  | |           ^^^^^^^ help: remove `mut` from the parameter: `arg` | 
|  | | | 
|  | note: the lint level is defined here | 
|  | --> $DIR/no-patterns-in-args-2.rs:1:9 | 
|  | | | 
|  | LL | #![deny(patterns_in_fns_without_body)] | 
|  | |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! | 
|  | = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203> | 
|  |  | 
|  | error: aborting due to 2 previous errors | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0642`. |