Misa 57f027e478 Add -Werror=implicit-fallthrough to CMakeLists.txt ...

This turns the implicit-fallthrough warning into a full compile-time
error.

Implicit fallthrough is when you forget a break statement in a
case-switch, thus letting one case fall through into the next case and
causing debugging headaches.

This is different from the good type of fallthrough that you use to have
one case with multiple different names, like so:

    case 0:
    case 1:
    case 2:

In that case, it's obvious that you want to have fallthrough there.

2020-04-17 15:41:48 -04:00

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