[fuhsnn]

It's been implemented in GCC(in review)[1], onramp[2] and my own slimcc[3]!

[1] https://patchwork.ozlabs.org/project/gcc/list/?series=470822

[2] https://github.com/ludocode/onramp

[3] https://github.com/fuhsnn/slimcc

[pjmlp]

A good example of adding stuff to the standard with community feedback from a preview implementation.