/in/foo.c:1:2: error: invalid preprocessing directive #iostlu
 #iostlu<iocuse>
  ^~~~~~
/in/foo.c:2:1: error: unknown type name 'using'
 using   naming   ard;
 ^~~~~
/in/foo.c:2:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'ard'
 using   naming   ard;
                  ^~~
/in/foo.c:4:1: error: expected identifier or '(' before '{' token
 {
 ^