Tracking Issue for error_generic_member_access #99301
Description
Feature gate: #![feature(error_generic_member_access)]
This is a tracking issue for the generic member access API on the error trait, which generalizes the pattern of fn source(&self) -> Option<&dyn Error> and fn backtrace(&self) -> Option<&Backtrace> into fn request_ref::<T>(&self) -> Option<&T>
Public API
// std::error pub trait Error: Debug + Display { // existing API unchanged fn provide<'a>(&'a self, req: &mut Demand<'a>) {} } impl dyn Error + Send + Sync + 'static { // and all combinations of send/sync pub fn request_ref<T: ?Sized + 'static>(&self) -> Option<&T> { core::any::request_ref(self) } pub fn request_value<T: 'static>(&self) -> Option<T> { core::any::request_value(self) } }Steps / History
Now tracked by @waynr in #99301 (comment)
Unresolved Questions
- None yet.