error: #[serde(from = "...")] and #[serde(try_from = "...")] conflict with each other
 --> tests/ui/conflict/from-try-from.rs:4:1
  |
4 | / #[serde(from = "u64", try_from = "u64")]
5 | | struct S {
6 | |     a: u8,
7 | | }
  | |_^