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Auto merge of #4367 - flip1995:doc_edition_2018_tests, r=phansch

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Document how to write tests requiring the 2018 edition

[Rendered](https://github.com/flip1995/rust-clippy/blob/doc_edition_2018_tests/doc/adding_lints.md#Edition-2018-tests)

cc #4365

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bors 2019-08-12 04:38:50 +00:00
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doc/adding_lints.md
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@ -10,6 +10,7 @@ because that's clearly a non-descriptive name.
* [Setup](#Setup)
* [Testing](#Testing)
* [Rustfix tests](#Rustfix-tests)
* [Edition 2018 tests](#Edition-2018-tests)
* [Lint declaration](#Lint-declaration)
* [Lint passes](#Lint-passes)
* [Emitting a lint](#Emitting-a-lint)
@ -101,6 +102,12 @@ Use `tests/ui/update-all-references.sh` to automatically generate the
With tests in place, let's have a look at implementing our lint now.
### Edition 2018 tests
Some features require the 2018 edition to work (e.g. `async_await`), but
compile-test tests run on the 2015 edition by default. To change this behavior
add `// compile-flags: --edition 2018` at the top of the test file.
### Testing manually
Manually testing against an example file can be useful if you have added some