/in/foo.c:2:1: error: unknown type name 'bool'
    2 | bool f[1048576*127];
      | ^~~~
/in/foo.c:2:1: note: 'bool' is defined in header '<stdbool.h>'; did you forget to '#include <stdbool.h>'?
    1 | #include<stdio.h>
  +++ |+#include <stdbool.h>
    2 | bool f[1048576*127];