feffe

    local
        val backupIntervalHours = 24
        val approxBackupDurationHours = 2
        val wiggleRoomHours = 2
    in
    val ageAlertThresholdHours = backupIntervalHours + approxBackupDurationHours + wiggleRoomHours
    end

  /*
  gcc -g -Wall -o x x.c
  gdb ./x
  (gdb) r
  (gdb) bt
  #0  0x0000000000000000 in ?? ()
  #1  0x0000555555554617 in foo () at x.c:6
  #2  0x0000555555554628 in main () at x.c:10
  (gdb) f 1
  #1  0x0000555555554617 in foo () at x.c:6
  6           bar();
  (gdb) p bar
  $1 = (void (*)(void)) 0x0
  */
  
  #include <stddef.h>
  
  void (*bar)(void) = NULL;
  
  void foo() {
      bar();
  }
  
  int main() {
      foo();
  }