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document `.x test --rustc-args` option

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Rémy Rakic 2023-07-03 20:24:29 +00:00 committed by Tshepang Mbambo
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commit 95ce2372ba
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src/tests/running.md
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@ -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