rustc_next_trait_solver: derivative -> derive-where

7 files changed, 19 insertions, 26 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 43010908fb0..e5b19ed5b55 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4488,7 +4488,7 @@ name = "rustc_next_trait_solver"
 version = "0.0.0"
 dependencies = [
  "bitflags 2.5.0",
- "derivative",
+ "derive-where",
  "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_index",
diff --git a/compiler/rustc_next_trait_solver/Cargo.toml b/compiler/rustc_next_trait_solver/Cargo.toml
index 07cd4ae68d9..cb0730e8673 100644
--- a/compiler/rustc_next_trait_solver/Cargo.toml
+++ b/compiler/rustc_next_trait_solver/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-derivative = "2.2.0"
+derive-where = "1.2.7"
 rustc_ast_ir = { path = "../rustc_ast_ir", default-features = false }
 rustc_data_structures = { path = "../rustc_data_structures", optional = true }
 rustc_index = { path = "../rustc_index", default-features = false }
diff --git a/compiler/rustc_next_trait_solver/src/coherence.rs b/compiler/rustc_next_trait_solver/src/coherence.rs
index 55f602d907b..f22ea41c512 100644
--- a/compiler/rustc_next_trait_solver/src/coherence.rs
+++ b/compiler/rustc_next_trait_solver/src/coherence.rs
@@ -1,6 +1,7 @@
 use std::fmt::Debug;
 use std::ops::ControlFlow;
 
+use derive_where::derive_where;
 use rustc_type_ir::inherent::*;
 use rustc_type_ir::visit::{TypeVisitable, TypeVisitableExt, TypeVisitor};
 use rustc_type_ir::{self as ty, InferCtxtLike, Interner};
@@ -108,15 +109,13 @@ impl From<bool> for IsFirstInputType {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(Debug(bound = "T: Debug"))]
+#[derive_where(Debug; I: Interner, T: Debug)]
 pub enum OrphanCheckErr<I: Interner, T> {
     NonLocalInputType(Vec<(I::Ty, IsFirstInputType)>),
     UncoveredTyParams(UncoveredTyParams<I, T>),
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(Debug(bound = "T: Debug"))]
+#[derive_where(Debug; I: Interner, T: Debug)]
 pub struct UncoveredTyParams<I: Interner, T> {
     pub uncovered: T,
     pub local_ty: Option<I::Ty>,
diff --git a/compiler/rustc_next_trait_solver/src/solve/assembly/mod.rs b/compiler/rustc_next_trait_solver/src/solve/assembly/mod.rs
index 01dde9ca587..f74597fcb39 100644
--- a/compiler/rustc_next_trait_solver/src/solve/assembly/mod.rs
+++ b/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>,
diff --git a/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs b/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs
index 7df14e81ab5..770ac9a929e 100644
--- a/compiler/rustc_next_trait_solver/src/solve/assembly/structural_traits.rs
+++ b/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,
diff --git a/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs b/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs
index c23bc8f09ad..e328284c001 100644
--- a/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs
@@ -1,5 +1,6 @@
 use std::ops::ControlFlow;
 
+use derive_where::derive_where;
 #[cfg(feature = "nightly")]
 use rustc_macros::{HashStable_NoContext, TyDecodable, TyEncodable};
 use rustc_type_ir::data_structures::ensure_sufficient_stack;
@@ -87,8 +88,7 @@ where
     pub(super) inspect: ProofTreeBuilder<D>,
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(Clone(bound = ""), Debug(bound = ""), Default(bound = ""))]
+#[derive_where(Clone, Debug, Default; I: Interner)]
 #[derive(TypeVisitable_Generic, TypeFoldable_Generic, Lift_Generic)]
 #[cfg_attr(feature = "nightly", derive(TyDecodable, TyEncodable, HashStable_NoContext))]
 // FIXME: This can be made crate-private once `EvalCtxt` also lives in this crate.
diff --git a/compiler/rustc_next_trait_solver/src/solve/inspect/build.rs b/compiler/rustc_next_trait_solver/src/solve/inspect/build.rs
index 3e266ddac71..36e13cc97d6 100644
--- a/compiler/rustc_next_trait_solver/src/solve/inspect/build.rs
+++ b/compiler/rustc_next_trait_solver/src/solve/inspect/build.rs
@@ -7,6 +7,7 @@
 use std::marker::PhantomData;
 use std::mem;
 
+use derive_where::derive_where;
 use rustc_type_ir::inherent::*;
 use rustc_type_ir::{self as ty, search_graph, Interner};
 
@@ -51,8 +52,7 @@ where
 /// in the code, only one or two variants are actually possible.
 ///
 /// We simply ICE in case that assumption is broken.
-#[derive(derivative::Derivative)]
-#[derivative(Debug(bound = ""))]
+#[derive_where(Debug; I: Interner)]
 enum DebugSolver<I: Interner> {
     Root,
     GoalEvaluation(WipGoalEvaluation<I>),
@@ -78,8 +78,7 @@ impl<I: Interner> From<WipCanonicalGoalEvaluationStep<I>> for DebugSolver<I> {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Debug(bound = ""))]
+#[derive_where(PartialEq, Eq, Debug; I: Interner)]
 struct WipGoalEvaluation<I: Interner> {
     pub uncanonicalized_goal: Goal<I, I::Predicate>,
     pub orig_values: Vec<I::GenericArg>,
@@ -96,8 +95,7 @@ impl<I: Interner> WipGoalEvaluation<I> {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""))]
+#[derive_where(PartialEq, Eq; I: Interner)]
 pub(in crate::solve) enum WipCanonicalGoalEvaluationKind<I: Interner> {
     Overflow,
     CycleInStack,
@@ -118,8 +116,7 @@ impl<I: Interner> std::fmt::Debug for WipCanonicalGoalEvaluationKind<I> {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Debug(bound = ""))]
+#[derive_where(PartialEq, Eq, Debug; I: Interner)]
 struct WipCanonicalGoalEvaluation<I: Interner> {
     goal: CanonicalInput<I>,
     kind: Option<WipCanonicalGoalEvaluationKind<I>>,
@@ -153,8 +150,7 @@ impl<I: Interner> WipCanonicalGoalEvaluation<I> {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Debug(bound = ""))]
+#[derive_where(PartialEq, Eq, Debug; I: Interner)]
 struct WipCanonicalGoalEvaluationStep<I: Interner> {
     /// Unlike `EvalCtxt::var_values`, we append a new
     /// generic arg here whenever we create a new inference
@@ -193,8 +189,7 @@ impl<I: Interner> WipCanonicalGoalEvaluationStep<I> {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Debug(bound = ""))]
+#[derive_where(PartialEq, Eq, Debug; I: Interner)]
 struct WipProbe<I: Interner> {
     initial_num_var_values: usize,
     steps: Vec<WipProbeStep<I>>,
@@ -212,8 +207,7 @@ impl<I: Interner> WipProbe<I> {
     }
 }
 
-#[derive(derivative::Derivative)]
-#[derivative(PartialEq(bound = ""), Eq(bound = ""), Debug(bound = ""))]
+#[derive_where(PartialEq, Eq, Debug; I: Interner)]
 enum WipProbeStep<I: Interner> {
     AddGoal(GoalSource, inspect::CanonicalState<I, Goal<I, I::Predicate>>),
     NestedProbe(WipProbe<I>),