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Jul 5, 2023
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document ./x test --rustc-args option #1719

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9 changes: 9 additions & 0 deletions src/tests/running.md
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Expand Up @@ -133,6 +133,15 @@ Under the hood, the test runner invokes the standard Rust test runner
filtering for tests that include "issue-1234" in the name. (Thus
`--test-args` is a good way to run a collection of related tests.)

## Passing arguments to `rustc` when running tests

It can sometimes be useful to run some tests with specific compiler arguments,
without using `RUSTFLAGS` (during development of unstable features, with `-Z`
flags, for example).

This can be done with `./x test`'s `--rustc-args` option, to pass additional
arguments to the compiler when building the tests.

## Editing and updating the reference files

If you have changed the compiler's output intentionally, or you are
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