 --> [ local path prefix ]/command/duplicate_param.fpp:3:26
  |
3 |   sync command C(a: U32, a: I32)
  |                          ^ duplicate parameter `a`
  |
 ::: [ local path prefix ]/command/duplicate_param.fpp:3:18
  |
3 |   sync command C(a: U32, a: I32)
  |                  - previously defined here

