error: FromOne can only be used with structs with a single field
 --> tests/failure/struct-multiple-named.rs:4:12
  |
4 | pub struct T {
  |            ^

error[E0308]: mismatched types
  --> tests/failure/struct-multiple-named.rs:10:24
   |
10 |     let _: T = T::from(1);
   |                ------- ^ expected `T`, found integer
   |                |
   |                arguments to this function are incorrect
   |
note: associated function defined here
  --> $RUST/core/src/convert/mod.rs
   |
   |     fn from(value: T) -> Self;
   |        ^^^^