foo.cc: In lambda function:
foo.cc:18:9: error: use of ‘fill’ before deduction of ‘auto’
   18 |         fill(layer + 1);
      |         ^~~~
foo.cc: In lambda function:
foo.cc:27:17: error: use of ‘print’ before deduction of ‘auto’
   27 |                 print(i, j + 1);
      |                 ^~~~~
foo.cc:30:17: error: use of ‘print’ before deduction of ‘auto’
   30 |                 print(i + 1, 0);
      |                 ^~~~~