clippy fails on `src/main.rs`

Clippy fails with:

error: field `0` is never read
  --> src/main.rs:45:16
   |
45 |     Bootconfig(std::io::Error),
   |     ---------- ^^^^^^^^^^^^^^
   |     |
   |     field in this variant
   |
   = note: `-D dead-code` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(dead_code)]`
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
   |
45 |     Bootconfig(()),
   |                ~~
error: field `0` is never read
  --> src/main.rs:46:15
   |
46 |     DiskImage(std::io::Error),
   |     --------- ^^^^^^^^^^^^^^
   |     |
   |     field in this variant
   |
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
   |
46 |     DiskImage(()),
   |               ~~
error: field `0` is never read
  --> src/main.rs:47:16
   |
47 |     Partitions(std::io::Error),
   |     ---------- ^^^^^^^^^^^^^^
   |     |
   |     field in this variant
   |
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
   |
47 |     Partitions(()),
   |                ~~
error: field `0` is never read
  --> src/main.rs:48:21
   |
48 |     TransformSparse(std::io::Error),
   |     --------------- ^^^^^^^^^^^^^^
   |     |
   |     field in this variant
   |
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
   |
48 |     TransformSparse(()),
   |                     ~~
error: field `0` is never read
  --> src/main.rs:49:11
   |
49 |     Uboot(std::io::Error),
   |     ----- ^^^^^^^^^^^^^^
   |     |
   |     field in this variant
   |
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
   |
49 |     Uboot(()),
   |           ~~
error: field `0` is never read
  --> src/main.rs:50:12
   |
50 |     Vbmeta(std::io::Error),
   |     ------ ^^^^^^^^^^^^^^
   |     |
   |     field in this variant
   |
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
   |
50 |     Vbmeta(()),
   |            ~~
error: could not compile `cvd2img` (bin "cvd2img") due to 6 previous errors