Ruby  2.7.2p137(2020-10-01revision5445e0435260b449decf2ac16f9d09bae3cafe72)
rubyio.h
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1 #if defined __GNUC__
2 #warning use "ruby/io.h" instead of "rubyio.h"
3 #elif defined _MSC_VER
4 #pragma message("warning: use \"ruby/io.h\" instead of \"rubyio.h\"")
5 #endif
6 #include "ruby/io.h"
io.h