core/any: remove Provider trait

* remove `impl Provider for Error`
* rename `Demand` to `Request`
* update docstrings to focus on the conceptual API provided by `Request`
* move `core::any::{request_ref, request_value}` functions into `core::error`
* move `core::any::tag`, `core::any::Request`, an `core::any::TaggedOption` into `core::error`
* replace `provide_any` feature name w/ `error_generic_member_access`
* move `core::error::request_{ref,value} tests into core::tests::error module
* update unit and doc tests

1 files changed, 2 insertions, 2 deletions

diff --git a/library/std/src/error/tests.rs b/library/std/src/error/tests.rs
index ee999bd65c3..ed070a26b0c 100644
--- a/library/std/src/error/tests.rs
+++ b/library/std/src/error/tests.rs
@@ -1,6 +1,6 @@
 use super::Error;
 use crate::fmt;
-use core::any::Demand;
+use core::error::Request;
 
 #[derive(Debug, PartialEq)]
 struct A;
@@ -199,7 +199,7 @@ where
         self.source.as_deref()
     }
 
-    fn provide<'a>(&'a self, req: &mut Demand<'a>) {
+    fn provide<'a>(&'a self, req: &mut Request<'a>) {
         self.backtrace.as_ref().map(|bt| req.provide_ref::<Backtrace>(bt));
     }
 }