On Sun, 2020-08-09 at 11:46 -0500, Steve French wrote: > Is this conversion from "/* Fallthrough */" to the preferred (?) > "fallthrough;" documented anywhere? Documentation/process/deprecated.rst As there have been a long list of flaws `due to missing "break" statements <https://cwe.mitre.org/data/definitions/484.html>`_, we no longer allow implicit fall-through. In order to identify intentional fall-through cases, we have adopted a pseudo-keyword macro "fallthrough" which expands to gcc's extension `__attribute__((__fallthrough__)) <https://gcc.gnu.org/onlinedocs/gcc/Statement-Attributes.html>`_.