Trait DomainReason 

pub trait DomainReason:
    PartialEq
    + Display
    + Debug
    + Send
    + Sync
    + 'static { }

Marker trait for domain-specific error reason types.

Implement this on your project’s error reason enum so it can be used as the generic parameter of StructError.

Constraints

Bound	Reason
Display + Debug	Errors must be printable for diagnostics and logging.
PartialEq	Enables assertion in tests (assert_eq!(err.reason(), MyReason::Foo)).
Send + Sync	Required for StructError to be Send + Sync, which is needed when errors cross async task boundaries or are captured by anyhow::Error / Box<dyn Error>.
'static	Enables type erasure via dyn Error and storage in SourceFrame.

These bounds match the de-facto standard for Rust error types (the Error trait requires 'static, and practical use requires Send for thread safety).

Derive

Prefer #[derive(OrionError)] (requires the derive feature), which also implements ErrorCode and ErrorIdentityProvider.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl DomainReason for UnifiedReason