error[E0130]: patterns aren't allowed in foreign function declarations
  --> $DIR/no-patterns-in-args.rs:2:11
   |
LL |     fn f1(mut arg: u8);
   |           ^^^^^^^ pattern not allowed in foreign function

error[E0130]: patterns aren't allowed in foreign function declarations
  --> $DIR/no-patterns-in-args.rs:3:11
   |
LL |     fn f2(&arg: u8);
   |           ^^^^ pattern not allowed in foreign function

error[E0130]: patterns aren't allowed in foreign function declarations
  --> $DIR/no-patterns-in-args.rs:4:11
   |
LL |     fn f3(arg @ _: u8);
   |           ^^^^^^^ pattern not allowed in foreign function

error[E0561]: patterns aren't allowed in function pointer types
  --> $DIR/no-patterns-in-args.rs:10:14
   |
LL | type A1 = fn(mut arg: u8);
   |              ^^^^^^^

error[E0561]: patterns aren't allowed in function pointer types
  --> $DIR/no-patterns-in-args.rs:11:14
   |
LL | type A2 = fn(&arg: u8);
   |              ^^^^

error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0130`.