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Update adding.md (#2016) 

Add `@' to the test header edition:2018
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10takla 2024-07-19 10:15:12 +03:00 committed by GitHub
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src/tests/adding.md
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@ -51,7 +51,7 @@ Let's place our async test at `tests/ui/async-await/await-without-async.rs`:
```rust,ignore
// Check what happens when using await in a non-async fn.
// edition:2018
//@ edition:2018
async fn foo() {}
@ -66,7 +66,7 @@ A few things to notice about our test:
* The top should start with a short comment that [explains what the test is
for](#explanatory_comment).
* The `// edition:2018` comment is called a [header](headers.md) which provides
* The `//@ edition:2018` comment is called a [header](headers.md) which provides
instructions to compiletest on how to build the test.
Here we need to set the edition for `async` to work (the default is 2015).
* Following that is the source of the test.