Trait bounds not met #12
Description
Unrelated to #10, while I can now get the derive on a struct with a lifetime parameter to compile, I can't get the usage of it in a function to compile.
Minimal example:
// The derive compiles fine now
#[derive(FromRow)]
struct User<'b> {
id: i32,
username: &'b str
}
// However, there's a lifetime issue when trying to use the derived function:
fn get_user_by_id<'c>(db: &mut impl postgres::GenericClient, id: i32) -> Result<User<'c>, postgres::Error> {
let row = db.query_one("SELECT * FROM User WHERE id = $1", &[&id])?;
User::try_from_row(&row)
}
Error:
error[E0599]: the function or associated item `try_from_row` exists for struct `User<'_>`, but its trait bounds were not satisfied
--> tests/integration.rs:14:11
|
6 | struct User<'b> {
| ---------------
| |
| function or associated item `try_from_row` not found for this struct
| doesn't satisfy `User<'_>: FromRow`
...
14 | User::try_from_row(&row)
| ^^^^^^^^^^^^ function or associated item cannot be called on `User<'_>` due to unsatisfied trait bounds
|
= note: trait bound `&str: FromSql<'__from_row_lifetime>` was not satisfied
(Note that this error at the usage site appears both with and without #11, just with the lifetime name in the error changed)