Add trait with method that won't collide between Provider and Error

Author: dtolnay

src/lib.rs

@@ -208,9 +208,12 @@
     clippy::return_self_not_must_use,
     clippy::wildcard_imports,
 )]
+#![cfg_attr(provide_any, feature(provide_any))]
 
 mod aserror;
 mod display;
+#[cfg(provide_any)]
+mod provide;
 
 pub use thiserror_impl::*;
 
@@ -219,4 +222,6 @@ pub use thiserror_impl::*;
 pub mod __private {
     pub use crate::aserror::AsDynError;
     pub use crate::display::{DisplayAsDisplay, PathAsDisplay};
+    #[cfg(provide_any)]
+    pub use crate::provide::ThiserrorProvide;
 }

src/provide.rs

@@ -0,0 +1,15 @@
+use std::any::{Demand, Provider};
+
+pub trait ThiserrorProvide: Sealed {
+    fn thiserror_provide<'a>(&'a self, demand: &mut Demand<'a>);
+}
+
+impl<T: Provider + ?Sized> ThiserrorProvide for T {
+    #[inline]
+    fn thiserror_provide<'a>(&'a self, demand: &mut Demand<'a>) {
+        self.provide(demand);
+    }
+}
+
+pub trait Sealed {}
+impl<T: Provider + ?Sized> Sealed for T {}