error[E0720]: cannot resolve opaque type | |
--> $DIR/binding-without-value.rs:5:13 | |
| | |
LL | let _ : impl Copy; | |
| - ^^^^^^^^^ cannot resolve opaque type | |
| | | |
| this binding might not have a concrete type | |
| | |
help: set the binding to a value for a concrete type to be resolved | |
| | |
LL | let _ : impl Copy = /* value */; | |
| ^^^^^^^^^^^^^ | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0720`. |