/in/foo.c: In function 'main':
/in/foo.c:29:8: error: 'true' undeclared (first use in this function)
  while(true)
        ^~~~
/in/foo.c:29:8: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c: At top level:
/in/foo.c:38:1: error: expected identifier or '(' before '}' token
 }
 ^