vlib/v/checker/tests/test_functions_should_not_return_test.vv:9:1: error: test functions should not return anything
    7 | 
    8 | // should be disallowed:
    9 | fn test_returning_int() int {
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   10 | 
   11 | }
vlib/v/checker/tests/test_functions_should_not_return_test.vv:14:1: error: test functions should not return anything
   12 | 
   13 | // should be disallowed:
   14 | fn test_returning_opt() ? {
      | ~~~~~~~~~~~~~~~~~~~~~~~~~
   15 | }
