Fix generated Error::provide and tests to reflect recent changes in nightly APIs (#294)

## Synopsis

Update derive and tests to work on the latest nightly with the changes
in [this PR](rust-lang/rust#113464).


## Solution

Use `error::{Request, request_ref, request_value}` instead of
`any::{Demand, request_ref, request_value}`.

Currently, `request_value` is not re-exported from `core::error` in
`std::error`, which means backtrace tests require
`#![feature(error_in_core)]`.

Presumably this is a bug, and will be fixed later.

Author: MegaBluejay

CHANGELOG.md

@@ -36,6 +36,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - The `Into` derive now uses `#[into(<types>)]` instead of `#[into(types(<types>))]`
   and ignores field type itself.
 - Importing a derive macro now also import its corresponding trait.
+- The `Error` derive is updated with changes to the `error_generic_member_access` unstable feature for nightly users. ([#200](https://github.com/JelteF/derive_more/pull/200), [#294](https://github.com/JelteF/derive_more/pull/294))
 
 ### Added
 

impl/doc/error.md

@@ -59,12 +59,13 @@ Backtraces don't work though, because the `Backtrace` type is only available in
 ## Example usage
 
 ```rust
-# #![cfg_attr(nightly, feature(error_generic_member_access, provide_any))]
+# #![cfg_attr(nightly, feature(error_generic_member_access, error_in_core))]
 // Nightly requires enabling these features:
-// #![feature(error_generic_member_access, provide_any)]
+// #![feature(error_generic_member_access, error_in_core)]
 # #[cfg(not(nightly))] fn main() {}
 # #[cfg(nightly)] fn main() {
-# use std::{any, error::Error as _, backtrace::Backtrace};
+# use core::error::{request_ref, request_value, Error as __};
+# use std::backtrace::Backtrace;
 #
 # use derive_more::{Display, Error, From};
 
@@ -129,7 +130,7 @@ enum CompoundError {
 }
 
 assert!(Simple.source().is_none());
-assert!(any::request_ref::<Backtrace>(&Simple).is_none());
+assert!(request_ref::<Backtrace>(&Simple).is_none());
 assert!(WithSource::default().source().is_some());
 assert!(WithExplicitSource::default().source().is_some());
 assert!(Tuple::default().source().is_some());
@@ -139,7 +140,7 @@ let with_source_and_backtrace = WithSourceAndBacktrace {
     backtrace: Backtrace::capture(),
 };
 assert!(with_source_and_backtrace.source().is_some());
-assert!(any::request_ref::<Backtrace>(&with_source_and_backtrace).is_some());
+assert!(request_ref::<Backtrace>(&with_source_and_backtrace).is_some());
 
 assert!(CompoundError::Simple.source().is_none());
 assert!(CompoundError::from(Simple).source().is_some());

impl/src/error.rs

@@ -47,7 +47,7 @@ pub fn expand(
 
     let provide = provide.map(|provide| {
         quote! {
-            fn provide<'_demand>(&'_demand self, demand: &mut ::core::any::Demand<'_demand>) {
+            fn provide<'_request>(&'_request self, request: &mut ::core::error::Request<'_request>) {
                 #provide
             }
         }
@@ -205,7 +205,7 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
         let source_provider = self.source.map(|source| {
             let source_expr = &self.data.members[source];
             quote! {
-                ::derive_more::Error::provide(&#source_expr, demand);
+                ::derive_more::Error::provide(&#source_expr, request);
             }
         });
         let backtrace_provider = self
@@ -215,7 +215,7 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
             .then(|| {
                 let backtrace_expr = &self.data.members[backtrace];
                 quote! {
-                    demand.provide_ref::<::std::backtrace::Backtrace>(&#backtrace_expr);
+                    request.provide_ref::<::std::backtrace::Backtrace>(&#backtrace_expr);
                 }
             });
 
@@ -235,7 +235,7 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
                 let pattern = self.data.matcher(&[source], &[quote! { source }]);
                 Some(quote! {
                     #pattern => {
-                        ::derive_more::Error::provide(source, demand);
+                        ::derive_more::Error::provide(source, request);
                     }
                 })
             }
@@ -246,16 +246,16 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
                 );
                 Some(quote! {
                     #pattern => {
-                        demand.provide_ref::<::std::backtrace::Backtrace>(backtrace);
-                        ::derive_more::Error::provide(source, demand);
+                        request.provide_ref::<::std::backtrace::Backtrace>(backtrace);
+                        ::derive_more::Error::provide(source, request);
                     }
                 })
             }
             None => {
                 let pattern = self.data.matcher(&[backtrace], &[quote! { backtrace }]);
                 Some(quote! {
                     #pattern => {
-                        demand.provide_ref::<::std::backtrace::Backtrace>(backtrace);
+                        request.provide_ref::<::std::backtrace::Backtrace>(backtrace);
                     }
                 })
             }

tests/error/nightly/derives_for_enums_with_backtrace.rs

@@ -1,6 +1,6 @@
 #![allow(dead_code)]
 
-use std::any;
+use core::error::{request_ref, request_value};
 
 use super::*;
 
@@ -146,7 +146,7 @@ impl TestErr {
     }
 
     fn get_source_backtrace(&self) -> &Backtrace {
-        any::request_ref(match self {
+        request_ref(match self {
             Self::NamedExplicitBacktraceFromSource { err }
             | Self::NamedExplicitDifferentSourceAndBacktrace { err, .. }
             | Self::NamedImplicitDifferentSourceAndBacktrace { err, .. }
@@ -163,14 +163,14 @@ type MyBacktrace = Backtrace;
 
 #[test]
 fn unit() {
-    assert!(any::request_ref::<Backtrace>(&TestErr::Unit).is_none());
+    assert!(request_ref::<Backtrace>(&TestErr::Unit).is_none());
 }
 
 #[test]
 fn named_implicit_no_backtrace() {
     let err = TestErr::NamedImplicitNoBacktrace { field: 0 };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
@@ -180,7 +180,7 @@ fn named_implicit_backtrace_by_field_name() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -191,7 +191,7 @@ fn named_implicit_backtrace_by_field_type() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -202,7 +202,7 @@ fn named_explicit_no_backtrace_by_field_name() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
@@ -212,7 +212,7 @@ fn named_explicit_no_backtrace_by_field_type() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
@@ -222,7 +222,7 @@ fn named_explicit_backtrace() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -233,7 +233,7 @@ fn named_explicit_no_backtrace_redundant() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
@@ -243,7 +243,7 @@ fn named_explicit_backtrace_by_field_name_redundant() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -254,7 +254,7 @@ fn named_explicit_backtrace_by_field_type_redundant() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -266,7 +266,7 @@ fn named_explicit_suppresses_implicit() {
         field: 0,
     };
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
     assert_bt!(!=, err, .get_unused_backtrace);
 }
@@ -280,8 +280,8 @@ fn named_implicit_no_backtrace_from_source() {
     };
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
-    assert!(any::request_value::<i32>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
+    assert!(request_value::<i32>(&err).is_none());
 }
 
 #[test]
@@ -293,8 +293,8 @@ fn named_explicit_no_backtrace_from_source() {
     };
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
-    assert!(any::request_value::<i32>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
+    assert!(request_value::<i32>(&err).is_none());
 }
 
 #[test]
@@ -306,8 +306,8 @@ fn named_explicit_backtrace_from_source() {
     };
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
-    assert_eq!(any::request_value::<i32>(&err), Some(42));
+    assert!(request_ref::<Backtrace>(&err).is_some());
+    assert_eq!(request_value::<i32>(&err), Some(42));
     assert_bt!(==, err, .get_source_backtrace);
 }
 
@@ -321,8 +321,8 @@ fn named_implicit_different_source_and_backtrace() {
     };
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
-    assert_eq!(any::request_value::<i32>(&err), Some(42));
+    assert!(request_ref::<Backtrace>(&err).is_some());
+    assert_eq!(request_value::<i32>(&err), Some(42));
     assert_bt!(==, err, .get_stored_backtrace);
     assert_bt!(!=, err, .get_source_backtrace);
 }
@@ -337,8 +337,8 @@ fn named_explicit_different_source_and_backtrace() {
     };
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
-    assert_eq!(any::request_value::<i32>(&err), Some(42));
+    assert!(request_ref::<Backtrace>(&err).is_some());
+    assert_eq!(request_value::<i32>(&err), Some(42));
     assert_bt!(==, err, .get_stored_backtrace);
     assert_bt!(!=, err, .get_source_backtrace);
 }
@@ -347,29 +347,29 @@ fn named_explicit_different_source_and_backtrace() {
 fn unnamed_implicit_no_backtrace() {
     let err = TestErr::UnnamedImplicitNoBacktrace(0, 0);
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
 fn unnamed_implicit_backtrace() {
     let err = TestErr::UnnamedImplicitBacktrace(Backtrace::force_capture(), 0, 0);
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
 #[test]
 fn unnamed_explicit_no_backtrace() {
     let err = TestErr::UnnamedExplicitNoBacktrace(Backtrace::force_capture(), 0);
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
 fn unnamed_explicit_backtrace() {
     let err = TestErr::UnnamedExplicitBacktrace(Backtrace::force_capture(), 0, 0);
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -378,15 +378,15 @@ fn unnamed_explicit_no_backtrace_redundant() {
     let err =
         TestErr::UnnamedExplicitNoBacktraceRedundant(Backtrace::force_capture(), 0);
 
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
 }
 
 #[test]
 fn unnamed_explicit_backtrace_redundant() {
     let err =
         TestErr::UnnamedExplicitBacktraceRedundant(Backtrace::force_capture(), 0, 0);
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
 }
 
@@ -398,7 +398,7 @@ fn unnamed_explicit_suppresses_implicit() {
         0,
     );
 
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
+    assert!(request_ref::<Backtrace>(&err).is_some());
     assert_bt!(==, err, .get_stored_backtrace);
     assert_bt!(!=, err, .get_unused_backtrace);
 }
@@ -410,8 +410,8 @@ fn unnamed_implicit_no_backtrace_from_source() {
     });
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
-    assert!(any::request_value::<i32>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
+    assert!(request_value::<i32>(&err).is_none());
 }
 
 #[test]
@@ -421,8 +421,8 @@ fn unnamed_explicit_no_backtrace_from_source() {
     });
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_none());
-    assert!(any::request_value::<i32>(&err).is_none());
+    assert!(request_ref::<Backtrace>(&err).is_none());
+    assert!(request_value::<i32>(&err).is_none());
 }
 
 #[test]
@@ -432,8 +432,8 @@ fn unnamed_explicit_backtrace_from_source() {
     });
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
-    assert_eq!(any::request_value::<i32>(&err), Some(42));
+    assert!(request_ref::<Backtrace>(&err).is_some());
+    assert_eq!(request_value::<i32>(&err), Some(42));
     assert_bt!(==, err, .get_source_backtrace);
 }
 
@@ -447,8 +447,8 @@ fn unnamed_implicit_different_source_and_backtrace() {
     );
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
-    assert_eq!(any::request_value::<i32>(&err), Some(42));
+    assert!(request_ref::<Backtrace>(&err).is_some());
+    assert_eq!(request_value::<i32>(&err), Some(42));
     assert_bt!(==, err, .get_stored_backtrace);
     assert_bt!(!=, err, .get_source_backtrace);
 }
@@ -463,8 +463,8 @@ fn unnamed_explicit_different_source_and_backtrace() {
     );
 
     assert!(err.source().is_some());
-    assert!(any::request_ref::<Backtrace>(&err).is_some());
-    assert_eq!(any::request_value::<i32>(&err), Some(42));
+    assert!(request_ref::<Backtrace>(&err).is_some());
+    assert_eq!(request_value::<i32>(&err), Some(42));
     assert_bt!(==, err, .get_stored_backtrace);
     assert_bt!(!=, err, .get_source_backtrace);
 }