Type Alias ParseWarning 

pub type ParseWarning = Arc<dyn Error + Send + Sync + 'static>;

A reference-counted, type-erased warning value.

Any type that implements core::error::Error + Send + Sync + 'static can be wrapped in a ParseWarning. The built-in library variants use EdidWarning, but custom handlers may push their own error types without wrapping them in EdidWarning.

Using Arc (rather than Box) means ParseWarning is Clone, which lets warnings be copied from a parsed representation into DisplayCapabilities without consuming the parsed result.

To inspect a specific variant, use the inherent downcast_ref method available on dyn core::error::Error + Send + Sync + 'static in std builds:

for w in caps.iter_warnings() {
    if let Some(ew) = (**w).downcast_ref::<EdidWarning>() { ... }
}

Aliased Type

pub struct ParseWarning { /* private fields */ }