error[E0425]: cannot find value `oops` in this scope --> $DIR/fn-help-with-err.rs:13:35 | LL | let arc = std::sync::Arc::new(oops); | ^^^^ not found in this scope error[E0599]: no method named `bar` found for struct `Arc<[closure@fn-help-with-err.rs:18:36]>` in the current scope --> $DIR/fn-help-with-err.rs:19:10 | LL | arc2.bar(); | ^^^ method not found in `Arc<[closure@fn-help-with-err.rs:18:36]>` | = help: items from traits can only be used if the trait is implemented and in scope note: `Bar` defines an item `bar`, perhaps you need to implement it --> $DIR/fn-help-with-err.rs:5:1 | LL | trait Bar { | ^^^^^^^^^ help: use parentheses to call this closure | LL | arc2().bar(); | ++ error: aborting due to 2 previous errors Some errors have detailed explanations: E0425, E0599. For more information about an error, try `rustc --explain E0425`.