[libcxx-commits] [libcxx] [libc++][test] Raise a useful error when no -std=c++NN flag is found to work (PR #99423)

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darker --check --diff -r befd44bcdc6e9d2f4099bf344826b2cd0fd8cbdc...33db30b634a81c869f4ee53c42a629e681c3c57c libcxx/utils/libcxx/test/params.py
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``````````diff
--- params.py	2024-07-18 03:05:19.000000 +0000
+++ params.py	2024-07-18 03:10:29.719308 +0000
@@ -85,10 +85,11 @@
     }
     if std in fallbacks and hasCompileFlag(cfg, "-std=" + fallbacks[std]):
         return "-std=" + fallbacks[std]
     return None
 
+
 def getDefaultStdValue(cfg):
     viable = [s for s in reversed(_allStandards) if getStdFlag(cfg, s)]
 
     if not viable:
         raise RuntimeError(

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https://github.com/llvm/llvm-project/pull/99423