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A few tests previously failed with various failure modes. For instance, `plugin-recomp-change` fails with: ``` Wrong exit code for plugin-recomp-change()(expected 0 , actual 2 ) Stderr ( plugin-recomp-change ): Simple Plugin Passes Queried Got options: Simple Plugin Pass Run C://GitLabRunner//builds//8fc0e283//0//ghc//ghc//inplace//mingw//bin/ld.exe: cannot find -lHSplugin-recompilation-0.1-CPeObcGoBuvHdwBnpK9jQq collect2.exe: error: ld returned 1 exit status `gcc.exe' failed in phase `Linker'. (Exit code: 1) make[2]: *** [Makefile:112: plugin-recomp-change] Error 1 *** unexpected failure for plugin-recomp-change(normal) ``` It's unclear whether the ghc-pkg concurrency issue mentioned in all.T is the culprit but the set of tests that fail overlaps strongly with the set of tests that lack the `multi_cpu_race` modifier. Let's see if adding it fixes them.
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