 --> [ local path prefix ]/expr/struct_duplicate.fpp:1:23
  |
1 | constant s = { x = 1, x = 2 }
  |                       ^^^^^ duplicate struct member `x`
  |
 ::: [ local path prefix ]/expr/struct_duplicate.fpp:1:20
  |
1 | constant s = { x = 1, x = 2 }
  |                    - previously defined here

