From fd16a0efeb3ae37960daeb9d5bd3600a1632c16f Mon Sep 17 00:00:00 2001
From: Pavel Grigorenko <GrigorenkoPV@ya.ru>
Date: Thu, 27 Jun 2024 01:29:49 +0300
Subject: [PATCH] rustc_middle: derivative -> derive-where

---
 Cargo.lock                             | 13 ++++++++++++-
 compiler/rustc_middle/Cargo.toml       |  2 +-
 compiler/rustc_middle/src/mir/query.rs | 13 ++++---------
 3 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index eba4eed3686..66007b2b6fe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1057,6 +1057,17 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "derive-where"
+version = "1.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62d671cc41a825ebabc75757b62d3d168c577f9149b2d49ece1dad1f72119d25"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.67",
+]
+
 [[package]]
 name = "derive_builder"
 version = "0.20.0"
@@ -4348,7 +4359,7 @@ name = "rustc_middle"
 version = "0.0.0"
 dependencies = [
  "bitflags 2.5.0",
- "derivative",
+ "derive-where",
  "either",
  "field-offset",
  "gsgdt",
diff --git a/compiler/rustc_middle/Cargo.toml b/compiler/rustc_middle/Cargo.toml
index 3dc592980fd..30f26d563ad 100644
--- a/compiler/rustc_middle/Cargo.toml
+++ b/compiler/rustc_middle/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"
 either = "1.5.0"
 field-offset = "0.3.5"
 gsgdt = "0.1.2"
diff --git a/compiler/rustc_middle/src/mir/query.rs b/compiler/rustc_middle/src/mir/query.rs
index cd8e28522ec..acf4414c4d6 100644
--- a/compiler/rustc_middle/src/mir/query.rs
+++ b/compiler/rustc_middle/src/mir/query.rs
@@ -2,6 +2,7 @@
 
 use crate::mir;
 use crate::ty::{self, CoroutineArgsExt, OpaqueHiddenType, Ty, TyCtxt};
+use derive_where::derive_where;
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir::def_id::LocalDefId;
@@ -224,13 +225,7 @@ rustc_data_structures::static_assert_size!(ConstraintCategory<'_>, 16);
 /// See also `rustc_const_eval::borrow_check::constraints`.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
 #[derive(TyEncodable, TyDecodable, HashStable, TypeVisitable, TypeFoldable)]
-#[derive(derivative::Derivative)]
-#[derivative(
-    PartialOrd,
-    Ord,
-    PartialOrd = "feature_allow_slow_enum",
-    Ord = "feature_allow_slow_enum"
-)]
+#[derive_where(PartialOrd, Ord)]
 pub enum ConstraintCategory<'tcx> {
     Return(ReturnConstraint),
     Yield,
@@ -240,7 +235,7 @@ pub enum ConstraintCategory<'tcx> {
     Cast {
         /// Whether this is an unsizing cast and if yes, this contains the target type.
         /// Region variables are erased to ReErased.
-        #[derivative(PartialOrd = "ignore", Ord = "ignore")]
+        #[derive_where(skip)]
         unsize_to: Option<Ty<'tcx>>,
     },
 
@@ -250,7 +245,7 @@ pub enum ConstraintCategory<'tcx> {
     ClosureBounds,
 
     /// Contains the function type if available.
-    CallArgument(#[derivative(PartialOrd = "ignore", Ord = "ignore")] Option<Ty<'tcx>>),
+    CallArgument(#[derive_where(skip)] Option<Ty<'tcx>>),
     CopyBound,
     SizedBound,
     Assignment,