| error[E0282]: type annotations needed for the closure `fn((), ()) -> std::result::Result<(), _>` | |
| --> $DIR/cannot-infer-closure.rs:3:15 | |
| | | |
| LL | Err(a)?; | |
| | ^ cannot infer type | |
| | | |
| help: give this closure an explicit return type without `_` placeholders | |
| | | |
| LL | let x = |a: (), b: ()| -> std::result::Result<(), _> { | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0282`. |