| error[E0277]: `&mut ()` is not a tuple |
| --> $DIR/issue-57404.rs:6:41 |
| | |
| LL | handlers.unwrap().as_mut().call_mut(&mut ()); |
| | -------- ^^^^^^^ the nightly-only, unstable trait `std::marker::Tuple` is not implemented for `&mut ()` |
| | | |
| | required by a bound introduced by this call |
| | |
| note: required by a bound in `call_mut` |
| --> $SRC_DIR/core/src/ops/function.rs:LL:COL |
| help: consider removing the leading `&`-reference |
| | |
| LL - handlers.unwrap().as_mut().call_mut(&mut ()); |
| LL + handlers.unwrap().as_mut().call_mut(()); |
| | |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0277`. |
