HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P  341 .ext/include/x86_64-linux/ruby/config.h #define HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P 1
HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P   32 include/ruby/ruby.h # undef HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P