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error[E0670]: `async fn` is not permitted in Rust 2015
--> $DIR/async-block-2015.rs:1:1
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LL | async fn foo() {
| ^^^^^ to use `async fn`, switch to Rust 2018 or later
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= help: pass `--edition 2021` to `rustc`
= note: for more on editions, read https://doc.rust-lang.org/edition-guide
error: expected identifier, found keyword `let`
--> $DIR/async-block-2015.rs:11:9
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LL | let y = async {
| ----- `async` blocks are only allowed in Rust 2018 or later
LL | let x = 42;
| ^^^ expected identifier, found keyword
|
= help: pass `--edition 2021` to `rustc`
= note: for more on editions, read https://doc.rust-lang.org/edition-guide
error: expected identifier, found `42`
--> $DIR/async-block-2015.rs:19:9
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LL | let z = async {
| ----- `async` blocks are only allowed in Rust 2018 or later
LL | 42
| ^^ expected identifier
|
= help: pass `--edition 2021` to `rustc`
= note: for more on editions, read https://doc.rust-lang.org/edition-guide
error[E0422]: cannot find struct, variant or union type `async` in this scope
--> $DIR/async-block-2015.rs:7:13
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LL | let x = async {};
| ^^^^^ `async` blocks are only allowed in Rust 2018 or later
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0422, E0670.
For more information about an error, try `rustc --explain E0422`.
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