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error[E0229]: associated type bindings are not allowed here
  --> $DIR/issue-84768.rs:7:11
   |
LL |     <F as FnOnce(&mut u8)>::call_once(f, 1)
   |           ^^^^^^^^^^^^^^^ associated type not allowed here

error[E0308]: mismatched types
  --> $DIR/issue-84768.rs:7:42
   |
LL |     <F as FnOnce(&mut u8)>::call_once(f, 1)
   |     ---------------------------------    ^ expected tuple, found integer
   |     |
   |     arguments to this function are incorrect
   |
   = note: expected tuple `(&mut u8,)`
               found type `{integer}`
note: associated function defined here
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   |
LL |     extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
   |                           ^^^^^^^^^

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0229, E0308.
For more information about an error, try `rustc --explain E0229`.