 --> [ local path prefix ]/component/struct_format_not_numeric.fpp:5:27
  |
5 | struct S2 { x: S1 format "{.3f}" }
  |                           ^^^^^ Fixed format replacement cannot be used for type `S1`
  |
 ::: [ local path prefix ]/component/struct_format_not_numeric.fpp:5:16
  |
5 | struct S2 { x: S1 format "{.3f}" }
  |                -- type defined here

