:-) Then you may well enjoy it. Plan 9 changes the way the C compiler works a little: for instance it is now prohibited to #include the same headers into files

:-) Then you may well enjoy it. Plan 9 changes the way the C compiler works a little: for instance it is now prohibited to #include the same headers into files that are #included into other files. No nested duplicate #includes. https://go.dev/talks/2012/splash.article https://go.dev/talks/2012/splash.article But the result is much much faster compilation.