v/vlib/v/checker/tests/string_interpolation_invalid_fmt.out

vlib/v/checker/tests/string_interpolation_invalid_fmt.vv:3:12: error: format specifier may only be one letter 
    1 | fn interpolate_wrong() string {
    2 |     a := 5
    3 |     x := '${a:xy}'
      |               ~~
    4 |     return x
    5 | }