From 20431706a863f92cb37dc512fef6e48d192aaf2c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:11:38 +0200
Subject: Merging upstream version 1.66.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 compiler/rustc_middle/src/ty/consts/kind.rs | 52 ++++++++++++++---------------
 1 file changed, 26 insertions(+), 26 deletions(-)

(limited to 'compiler/rustc_middle/src/ty/consts/kind.rs')

diff --git a/compiler/rustc_middle/src/ty/consts/kind.rs b/compiler/rustc_middle/src/ty/consts/kind.rs
index 455015280..4ab761e07 100644
--- a/compiler/rustc_middle/src/ty/consts/kind.rs
+++ b/compiler/rustc_middle/src/ty/consts/kind.rs
@@ -1,10 +1,11 @@
 use std::convert::TryInto;
 
+use crate::mir;
 use crate::mir::interpret::{AllocId, ConstValue, Scalar};
-use crate::mir::Promoted;
 use crate::ty::subst::{InternalSubsts, SubstsRef};
 use crate::ty::ParamEnv;
 use crate::ty::{self, TyCtxt, TypeVisitable};
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir::def_id::DefId;
 use rustc_macros::HashStable;
@@ -12,40 +13,34 @@ use rustc_target::abi::Size;
 
 use super::ScalarInt;
 
-/// An unevaluated, potentially generic, constant.
+/// An unevaluated (potentially generic) constant used in the type-system.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Lift)]
-#[derive(Hash, HashStable)]
-pub struct Unevaluated<'tcx, P = Option<Promoted>> {
+#[derive(Hash, HashStable, TypeFoldable, TypeVisitable)]
+pub struct UnevaluatedConst<'tcx> {
     pub def: ty::WithOptConstParam<DefId>,
     pub substs: SubstsRef<'tcx>,
-    pub promoted: P,
 }
 
-impl rustc_errors::IntoDiagnosticArg for Unevaluated<'_> {
+impl rustc_errors::IntoDiagnosticArg for UnevaluatedConst<'_> {
     fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
         format!("{:?}", self).into_diagnostic_arg()
     }
 }
 
-impl<'tcx> Unevaluated<'tcx> {
-    #[inline]
-    pub fn shrink(self) -> Unevaluated<'tcx, ()> {
-        debug_assert_eq!(self.promoted, None);
-        Unevaluated { def: self.def, substs: self.substs, promoted: () }
-    }
-}
-
-impl<'tcx> Unevaluated<'tcx, ()> {
+impl<'tcx> UnevaluatedConst<'tcx> {
     #[inline]
-    pub fn expand(self) -> Unevaluated<'tcx> {
-        Unevaluated { def: self.def, substs: self.substs, promoted: None }
+    pub fn expand(self) -> mir::UnevaluatedConst<'tcx> {
+        mir::UnevaluatedConst { def: self.def, substs: self.substs, promoted: None }
     }
 }
 
-impl<'tcx, P: Default> Unevaluated<'tcx, P> {
+impl<'tcx> UnevaluatedConst<'tcx> {
     #[inline]
-    pub fn new(def: ty::WithOptConstParam<DefId>, substs: SubstsRef<'tcx>) -> Unevaluated<'tcx, P> {
-        Unevaluated { def, substs, promoted: Default::default() }
+    pub fn new(
+        def: ty::WithOptConstParam<DefId>,
+        substs: SubstsRef<'tcx>,
+    ) -> UnevaluatedConst<'tcx> {
+        UnevaluatedConst { def, substs }
     }
 }
 
@@ -67,7 +62,7 @@ pub enum ConstKind<'tcx> {
 
     /// Used in the HIR by using `Unevaluated` everywhere and later normalizing to one of the other
     /// variants when the code is monomorphic enough for that.
-    Unevaluated(Unevaluated<'tcx, ()>),
+    Unevaluated(UnevaluatedConst<'tcx>),
 
     /// Used to hold computed value.
     Value(ty::ValTree<'tcx>),
@@ -114,7 +109,6 @@ impl<'tcx> ConstKind<'tcx> {
 
 /// An inference variable for a const, for use in const generics.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Hash)]
-#[derive(HashStable)]
 pub enum InferConst<'tcx> {
     /// Infer the value of the const.
     Var(ty::ConstVid<'tcx>),
@@ -122,6 +116,15 @@ pub enum InferConst<'tcx> {
     Fresh(u32),
 }
 
+impl<CTX> HashStable<CTX> for InferConst<'_> {
+    fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher) {
+        match self {
+            InferConst::Var(_) => panic!("const variables should not be hashed: {self:?}"),
+            InferConst::Fresh(i) => i.hash_stable(hcx, hasher),
+        }
+    }
+}
+
 enum EvalMode {
     Typeck,
     Mir,
@@ -185,8 +188,6 @@ impl<'tcx> ConstKind<'tcx> {
         if let ConstKind::Unevaluated(unevaluated) = self {
             use crate::mir::interpret::ErrorHandled;
 
-            assert_eq!(unevaluated.promoted, ());
-
             // HACK(eddyb) this erases lifetimes even though `const_eval_resolve`
             // also does later, but we want to do it before checking for
             // inference variables.
@@ -204,10 +205,9 @@ impl<'tcx> ConstKind<'tcx> {
             // FIXME(eddyb, skinny121) pass `InferCtxt` into here when it's available, so that
             // we can call `infcx.const_eval_resolve` which handles inference variables.
             let param_env_and = if param_env_and.needs_infer() {
-                tcx.param_env(unevaluated.def.did).and(ty::Unevaluated {
+                tcx.param_env(unevaluated.def.did).and(ty::UnevaluatedConst {
                     def: unevaluated.def,
                     substs: InternalSubsts::identity_for_item(tcx, unevaluated.def.did),
-                    promoted: (),
                 })
             } else {
                 param_env_and
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