|  | error: associated function in `impl` without body | 
|  | --> $DIR/issue-95023.rs:8:5 | 
|  | | | 
|  | LL |     fn foo<const N: usize>(&self) -> Self::B<{ N }>; | 
|  | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- | 
|  | |                                                    | | 
|  | |                                                    help: provide a definition for the function: `{ <body> }` | 
|  |  | 
|  | error[E0407]: method `foo` is not a member of trait `Fn` | 
|  | --> $DIR/issue-95023.rs:8:5 | 
|  | | | 
|  | LL |     fn foo<const N: usize>(&self) -> Self::B<{ N }>; | 
|  | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not a member of trait `Fn` | 
|  |  | 
|  | error[E0183]: manual implementations of `Fn` are experimental | 
|  | --> $DIR/issue-95023.rs:3:6 | 
|  | | | 
|  | LL | impl Fn(&isize) for Error { | 
|  | |      ^^^^^^^^^^ manual implementations of `Fn` are experimental | 
|  | | | 
|  | = help: add `#![feature(unboxed_closures)]` to the crate attributes to enable | 
|  |  | 
|  | error[E0229]: associated item constraints are not allowed here | 
|  | --> $DIR/issue-95023.rs:3:6 | 
|  | | | 
|  | LL | impl Fn(&isize) for Error { | 
|  | |      ^^^^^^^^^^ associated item constraint not allowed here | 
|  | | | 
|  | help: parenthesized trait syntax expands to `Fn<(&isize,), Output=()>` | 
|  | --> $DIR/issue-95023.rs:3:6 | 
|  | | | 
|  | LL | impl Fn(&isize) for Error { | 
|  | |      ^^^^^^^^^^ | 
|  |  | 
|  | error[E0046]: not all trait items implemented, missing: `call` | 
|  | --> $DIR/issue-95023.rs:3:1 | 
|  | | | 
|  | LL | impl Fn(&isize) for Error { | 
|  | | ^^^^^^^^^^^^^^^^^^^^^^^^^ missing `call` in implementation | 
|  | | | 
|  | = help: implement the missing item: `fn call(&self, _: (&isize,)) -> <Self as FnOnce<(&isize,)>>::Output { todo!() }` | 
|  |  | 
|  | error[E0277]: expected a `FnMut(&isize)` closure, found `Error` | 
|  | --> $DIR/issue-95023.rs:3:21 | 
|  | | | 
|  | LL | impl Fn(&isize) for Error { | 
|  | |                     ^^^^^ expected an `FnMut(&isize)` closure, found `Error` | 
|  | | | 
|  | help: the trait `FnMut(&isize)` is not implemented for `Error` | 
|  | --> $DIR/issue-95023.rs:2:1 | 
|  | | | 
|  | LL | struct Error(ErrorKind); | 
|  | | ^^^^^^^^^^^^ | 
|  | note: required by a bound in `Fn` | 
|  | --> $SRC_DIR/core/src/ops/function.rs:LL:COL | 
|  |  | 
|  | error[E0220]: associated type `B` not found for `Self` | 
|  | --> $DIR/issue-95023.rs:8:44 | 
|  | | | 
|  | LL |     fn foo<const N: usize>(&self) -> Self::B<{ N }>; | 
|  | |                                            ^ help: `Self` has the following associated type: `Output` | 
|  |  | 
|  | error: aborting due to 7 previous errors | 
|  |  | 
|  | Some errors have detailed explanations: E0046, E0183, E0220, E0229, E0277, E0407. | 
|  | For more information about an error, try `rustc --explain E0046`. |