error[E0670]: `async fn` is not permitted in Rust 2015 --> $DIR/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs:8:16 | LL | pub(crate) async fn new( | ^^^^^ to use `async fn`, switch to Rust 2018 or later | = help: pass `--edition 2021` to `rustc` = note: for more on editions, read https://doc.rust-lang.org/edition-guide error[E0412]: cannot find type `Duration` in this scope --> $DIR/drop-location-span-error-rust-2021-incompatible-closure-captures-96258.rs:10:19 | LL | interval: Duration, | ^^^^^^^^ not found in this scope | help: consider importing this struct | LL | use std::time::Duration; | error: aborting due to 2 previous errors Some errors have detailed explanations: E0412, E0670. For more information about an error, try `rustc --explain E0412`.