[PATCH] D91895: [Clang] improve -Wimplicit-fallthrough GCC compat

[Arthur O'Dwyer via Phabricator via cfe-commits]

Quuxplusone added a comment.

In D91895#2417170 <https://reviews.llvm.org/D91895#2417170>, @kees wrote:

> I think this should warn too. While this won't turn into a "missing break" error, there's no way to know (from looking at code) what the _intent_ is here.

Hear, hear. +1 on everything @kees said but especially this.
(Also: <https://quuxplusone.github.io/blog/2020/09/02/wparentheses/#the-job-of-the-compiler-diagnost> "The job of the compiler-diagnostic-developer is to create some separation between the space of inputs that the compiler considers “clearly X” and the space of inputs that the compiler considers “clearly Y.” Essentially, we create an error-correcting code by deliberately increasing the edit distance between pairs of inequivalent C++ programs — deliberately increasing the number of keystrokes the programmer would have to screw up in order to transform a working (and warning-free) C++ program into an inequivalent broken (yet warning-free) C++ program.")


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