v/vlib/v/checker/tests/propagate_result_with_option.out

vlib/v/checker/tests/propagate_result_with_option.vv:6:8: error: to propagate a result, the call must also return a result type
    4 | 
    5 | fn bar() !string {
    6 |     foo() !
      |           ^
    7 |     return ''
    8 | }