error[E0601]: `main` function not found in crate `ice_6250` --> $DIR/ice-6250.rs:16:2 | LL | } | ^ consider adding a `main` function to `$DIR/ice-6250.rs` error[E0308]: mismatched types --> $DIR/ice-6250.rs:12:14 | LL | for reference in vec![1, 2, 3] { | --------- expected due to the type of this binding ... LL | Some(reference) = cache.data.get(key) { | ^^^^^^^^^ expected integer, found `&i32` | help: consider dereferencing the borrow | LL | Some(*reference) = cache.data.get(key) { | + error[E0308]: mismatched types --> $DIR/ice-6250.rs:12:9 | LL | Some(reference) = cache.data.get(key) { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found `()` | help: consider adding `let` | LL | let Some(reference) = cache.data.get(key) { | +++ error: aborting due to 3 previous errors Some errors have detailed explanations: E0308, E0601. For more information about an error, try `rustc --explain E0308`.