4a5f1cc52b
tests: Port `translation` to rmake.rs Part of #121876. This PR partially supersedes #129011 and is co-authored with `@Oneirical.` ## Summary This PR ports `tests/run-make/translation` to rmake.rs. Notable changes from the Makefile version include: - We now actually fail if the rustc invocations fail... The Makefile did not have `SHELL=/bin/bash -o pipefail`, so all the piped rustc invocations to grep vacuously succeeded, even if the broken ftl test case actually regressed over time and ICEs on current master. - That test case is converted to assert it fails with a FIXME backlinking to #135817. - The test coverage is expanded to not ignore windows. Instead, the test now uses symlink capability detection to gate test execution. - Added some backlinks to relevant tracking issues and the initial translation infra implementation PR. ## Review advice Best reviewed commit-by-commit. r? compiler try-job: aarch64-apple try-job: i686-mingw
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