Sporadic failures: Date | PR | Test Run ---|---|--- 2023-08-10 | #3913 | https://dev.azure.com/vclibs/STL/_build/results?buildId=14819&view=results 2023-08-10 | #3947 (CI) | https://dev.azure.com/vclibs/STL/_build/results?buildId=14823&view=results 2023-08-17 | #3952 (CI) | https://dev.azure.com/vclibs/STL/_build/results?buildId=14889&view=results 2023-09-12 | #4024 | https://dev.azure.com/vclibs/STL/_build/results?buildId=15013&view=results ``` D:\a\_work\1\s\llvm-project\libcxx\test\std\strings\basic.string\string.cons\copy.pass.cpp(56): error C2131: expression did not evaluate to a constant ``` It's highly curious that a compiler error could be sporadic. This might be related to #3862.