vlib/v/checker/tests/option_propagate_nested.vv:10:18: error: to propagate the Option call, `xx_prop` must return an Option
    8 | 
    9 | fn xx_prop() string {
   10 |     s := ret(raise()?)
      |                     ^
   11 |     return s
   12 | }
Details: vlib/v/checker/tests/option_propagate_nested.vv:9:14: details: prepend ? before the declaration of the return type of `xx_prop`
    7 | }
    8 | 
    9 | fn xx_prop() string {
      |              ~~~~~~
   10 |     s := ret(raise()?)
   11 |     return s
vlib/v/checker/tests/option_propagate_nested.vv:10:18: error: to propagate the call, `xx_prop` must return an Option type
    8 | 
    9 | fn xx_prop() string {
   10 |     s := ret(raise()?)
      |                     ^
   11 |     return s
   12 | }
Details: vlib/v/checker/tests/option_propagate_nested.vv:9:14: details: prepend ? before the declaration of the return type of `xx_prop`
    7 | }
    8 | 
    9 | fn xx_prop() string {
      |              ~~~~~~
   10 |     s := ret(raise()?)
   11 |     return s
vlib/v/checker/tests/option_propagate_nested.vv:28:21: error: to propagate the Result call, `aa_propagate` must return a Result
   26 | 
   27 | fn (mut s St) aa_propagate() {
   28 |     f := retf(s.raise()!)
      |                        ^
   29 |     s.z = 7.5
   30 |     println(f)
Details: vlib/v/checker/tests/option_propagate_nested.vv:27:30: details: prepend ! before the declaration of the return type of `aa_propagate`
   25 | }
   26 | 
   27 | fn (mut s St) aa_propagate() {
      |                              ^
   28 |     f := retf(s.raise()!)
   29 |     s.z = 7.5
vlib/v/checker/tests/option_propagate_nested.vv:28:21: error: to propagate the call, `aa_propagate` must return a Result type
   26 | 
   27 | fn (mut s St) aa_propagate() {
   28 |     f := retf(s.raise()!)
      |                        ^
   29 |     s.z = 7.5
   30 |     println(f)
Details: vlib/v/checker/tests/option_propagate_nested.vv:27:30: details: prepend ! before the declaration of the return type of `aa_propagate`
   25 | }
   26 | 
   27 | fn (mut s St) aa_propagate() {
      |                              ^
   28 |     f := retf(s.raise()!)
   29 |     s.z = 7.5