Support core::error::Error

packages/libs/error-stack/src/context.rs

@@ -1,15 +1,19 @@
 #[cfg(nightly)]
 use core::any::Demand;
+#[cfg(nightly)]
+use core::error::Error;
 use core::fmt;
+#[cfg(all(not(nightly), feature = "std"))]
+use std::error::Error;
 
 use crate::Report;
 
 /// Defines the current context of a [`Report`].
 ///
-/// When in a `std` environment, every [`Error`] is a valid `Context`. This trait is not limited to
-/// [`Error`]s and can also be manually implemented for custom objects.
+/// When in a `std` environment or on a nightly toolchain, every [`Error`] is a valid `Context`.
+/// This trait is not limited to [`Error`]s and can also be manually implemented for custom objects.
 ///
-/// [`Error`]: std::error::Error
+/// [`Error`]: core::error::Error
 ///
 /// ## Example
 ///
@@ -80,10 +84,10 @@ where
     }
 }
 
-#[cfg(feature = "std")]
-impl<C: std::error::Error + Send + Sync + 'static> Context for C {
+#[cfg(any(nightly, feature = "std"))]
+impl<C: Error + Send + Sync + 'static> Context for C {
     #[cfg(nightly)]
     fn provide<'a>(&'a self, demand: &mut Demand<'a>) {
-        std::error::Error::provide(self, demand);
+        Error::provide(self, demand);
     }
 }

packages/libs/error-stack/src/lib.rs

@@ -438,7 +438,7 @@
 //! [`SpanTrace`]: tracing_error::SpanTrace
 //! [`smallvec`]: https://docs.rs/smallvec
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(nightly, feature(provide_any))]
+#![cfg_attr(nightly, feature(provide_any, error_in_core))]
 #![cfg_attr(all(doc, nightly), feature(doc_auto_cfg))]
 #![cfg_attr(
     all(nightly, feature = "std"),

packages/libs/error-stack/src/macros.rs

@@ -73,7 +73,7 @@ pub mod __private {
 ///
 /// [`Report`]: crate::Report
 /// [`Context`]: crate::Context
-/// [`Error`]: std::error::Error
+/// [`Error`]: core::error::Error
 ///
 /// # Examples
 ///
@@ -144,7 +144,7 @@ macro_rules! report {
 ///
 /// Create a [`Report`] from [`Error`]:
 ///
-/// [`Error`]: std::error::Error
+/// [`Error`]: core::error::Error
 ///
 /// ```
 /// # #[cfg(all(not(miri), feature = "std"))] {