[libcxx-commits] [libcxx] [llvm] [libc++] Optionally support filecheck-based tests (PR #165769)

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darker --check --diff -r origin/main...HEAD libcxx/utils/libcxx/test/features/misc.py
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``````````diff
--- misc.py	2026-03-19 20:03:59.000000 +0000
+++ misc.py	2026-03-19 20:05:34.761184 +0000
@@ -294,20 +294,19 @@
               return 0;
             }
             """,
         ),
     ),
-
     # Whether a `FileCheck` executable is available. Note that we intend not to depend
     # on how that executable has been installed: we can either use the LLVM FileCheck
     # executable or the `filecheck` Python port of the same utility.
     Feature(
         name="has-filecheck",
         when=lambda cfg: runScriptExitCode(cfg, ["filecheck --version"]) == 0,
-        actions=[AddSubstitution("%{filecheck}", "filecheck")]
+        actions=[AddSubstitution("%{filecheck}", "filecheck")],
     ),
     Feature(
         name="has-filecheck",
         when=lambda cfg: runScriptExitCode(cfg, ["FileCheck --version"]) == 0,
-        actions=[AddSubstitution("%{filecheck}", "FileCheck")]
+        actions=[AddSubstitution("%{filecheck}", "FileCheck")],
     ),
 ]

``````````

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https://github.com/llvm/llvm-project/pull/165769