error[E0282]: type annotations needed for the closure `fn((), ()) -> std::result::Result<(), _>` | |
--> $DIR/cannot-infer-closure.rs:3:9 | |
| | |
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`. |