[flang-commits] [flang] [Flang] Add fallthrough annotations in visit.h (PR #90014)

[Slava Zakharin via flang-commits]

vzakhari wrote:

@alexander-shaposhnikov, FYI, this broke Fortran runtime builders: https://lab.llvm.org/buildbot/#/builders/267/builds/1277
I expect other bots that build flang will also fail, but later.

https://github.com/llvm/llvm-project/pull/90014