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Add regression test for issue 405

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error[E0599]: the method `as_display` exists for reference `&<T as FromStr>::Err`, but its trait bounds were not satisfied
       --> tests/test_generics.rs:178:13
        |
    178 |     #[error("couldn't parse entry: {0}")]
        |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ method cannot be called on `&<T as FromStr>::Err` due to unsatisfied trait bounds
        |
        = note: the following trait bounds were not satisfied:
                `<T as FromStr>::Err: std::fmt::Display`
                which is required by `&<T as FromStr>::Err: AsDisplay<'_>`
This commit is contained in:
David Tolnay 2025-01-08 11:34:40 -08:00
parent c535cecb6f
commit 136859154b
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1 changed files with 19 additions and 0 deletions
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19
tests/test_generics.rs
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@ -1,6 +1,7 @@
#![allow(clippy::needless_late_init, clippy::uninlined_format_args)]
use core::fmt::{self, Debug, Display};
use core::str::FromStr;
use thiserror::Error;
pub struct NoFormat;
@ -160,6 +161,24 @@ pub struct StructFromGeneric<E> {
#[error(transparent)]
pub struct StructTransparentGeneric<E>(pub E);
// Should expand to:
//
// impl<T: FromStr> Display for AssociatedTypeError<T>
// where
// T::Err: Display;
//
// impl<T: FromStr> Error for AssociatedTypeError<T>
// where
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum AssociatedTypeError<T: FromStr> {
#[error("couldn't parse matrix")]
Other,
#[error("couldn't parse entry: {0}")]
EntryParseError(T::Err),
}
// Regression test for https://github.com/dtolnay/thiserror/issues/345
#[test]
fn test_no_bound_on_named_fmt() {