rustc_next_trait_solver: derivative -> derive-where

compiler/rustc_next_trait_solver/src/solve/assembly/mod.rs

@@ -2,6 +2,7 @@
 
 pub(super) mod structural_traits;
 
+use derive_where::derive_where;
 use rustc_type_ir::elaborate;
 use rustc_type_ir::fold::TypeFoldable;
 use rustc_type_ir::inherent::*;
@@ -21,8 +22,7 @@ use crate::solve::{
 ///
 /// It consists of both the `source`, which describes how that goal would be proven,
 /// and the `result` when using the given `source`.
-#[derive(derivative::Derivative)]
-#[derivative(Debug(bound = ""), Clone(bound = ""))]
+#[derive_where(Clone, Debug; I: Interner)]
 pub(super) struct Candidate<I: Interner> {
     pub(super) source: CandidateSource<I>,
     pub(super) result: CanonicalResponse<I>,

compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs

@@ -1,6 +1,7 @@
 //! Code which is used by built-in goals that match "structurally", such a auto
 //! traits, `Copy`/`Clone`.
 
+use derive_where::derive_where;
 use rustc_ast_ir::{Movability, Mutability};
 use rustc_type_ir::data_structures::HashMap;
 use rustc_type_ir::fold::{TypeFoldable, TypeFolder, TypeSuperFoldable};
@@ -384,8 +385,7 @@ pub(in crate::solve) fn extract_tupled_inputs_and_output_from_callable<I: Intern
 
 /// Relevant types for an async callable, including its inputs, output,
 /// and the return type you get from awaiting the output.
-#[derive(derivative::Derivative)]
-#[derivative(Clone(bound = ""), Copy(bound = ""), Debug(bound = ""))]
+#[derive_where(Clone, Copy, Debug; I: Interner)]
 #[derive(TypeVisitable_Generic, TypeFoldable_Generic)]
 pub(in crate::solve) struct AsyncCallableRelevantTypes<I: Interner> {
     pub tupled_inputs_ty: I::Ty,