Uplift InferConst to rustc_type_ir

5 files changed, 2 insertions, 77 deletions

diff --git a/compiler/rustc_middle/src/ty/consts/kind.rs b/compiler/rustc_middle/src/ty/consts/kind.rs
index 4af841fcf9a..16e7b16a0bf 100644
--- a/compiler/rustc_middle/src/ty/consts/kind.rs
+++ b/compiler/rustc_middle/src/ty/consts/kind.rs
@@ -3,7 +3,6 @@ use crate::mir;
 use crate::ty::abstract_const::CastKind;
 use crate::ty::GenericArgsRef;
 use crate::ty::{self, visit::TypeVisitableExt as _, List, Ty, TyCtxt};
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_hir::def_id::DefId;
 use rustc_macros::HashStable;
 
@@ -77,28 +76,3 @@ static_assert_size!(Expr<'_>, 24);
 
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 static_assert_size!(super::ConstKind<'_>, 32);
-
-/// An inference variable for a const, for use in const generics.
-#[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Hash)]
-pub enum InferConst {
-    /// Infer the value of the const.
-    Var(ty::ConstVid),
-    /// Infer the value of the effect.
-    ///
-    /// For why this is separate from the `Var` variant above, see the
-    /// documentation on `EffectVid`.
-    EffectVar(ty::EffectVid),
-    /// A fresh const variable. See `infer::freshen` for more details.
-    Fresh(u32),
-}
-
-impl<CTX> HashStable<CTX> for InferConst {
-    fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher) {
-        match self {
-            InferConst::Var(_) | InferConst::EffectVar(_) => {
-                panic!("const variables should not be hashed: {self:?}")
-            }
-            InferConst::Fresh(i) => i.hash_stable(hcx, hasher),
-        }
-    }
-}
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index b2a379064d6..62b0536dabe 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -102,7 +102,6 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type AllocId = crate::mir::interpret::AllocId;
 
     type Const = ty::Const<'tcx>;
-    type InferConst = ty::InferConst;
     type AliasConst = ty::UnevaluatedConst<'tcx>;
     type PlaceholderConst = ty::PlaceholderConst;
     type ParamConst = ty::ParamConst;
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 559bf9fb825..2436daf62cf 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -84,9 +84,7 @@ pub use self::closure::{
     CapturedPlace, ClosureKind, ClosureTypeInfo, MinCaptureInformationMap, MinCaptureList,
     RootVariableMinCaptureList, UpvarCapture, UpvarId, UpvarPath, CAPTURE_STRUCT_LOCAL,
 };
-pub use self::consts::{
-    Const, ConstData, ConstInt, Expr, InferConst, ScalarInt, UnevaluatedConst, ValTree,
-};
+pub use self::consts::{Const, ConstData, ConstInt, Expr, ScalarInt, UnevaluatedConst, ValTree};
 pub use self::context::{
     tls, CtxtInterners, DeducedParamAttrs, FreeRegionInfo, GlobalCtxt, Lift, TyCtxt, TyCtxtFeed,
 };
@@ -98,7 +96,7 @@ pub use self::sty::BoundRegionKind::*;
 pub use self::sty::{
     AliasTy, Article, Binder, BoundRegion, BoundRegionKind, BoundTy, BoundTyKind, BoundVar,
     BoundVariableKind, CanonicalPolyFnSig, ClauseKind, ClosureArgs, ClosureArgsParts, ConstKind,
-    ConstVid, CoroutineArgs, CoroutineArgsParts, EarlyParamRegion, EffectVid, ExistentialPredicate,
+    CoroutineArgs, CoroutineArgsParts, EarlyParamRegion, ExistentialPredicate,
     ExistentialProjection, ExistentialTraitRef, FnSig, GenSig, InlineConstArgs,
     InlineConstArgsParts, LateParamRegion, ParamConst, ParamTy, PolyExistentialPredicate,
     PolyExistentialProjection, PolyExistentialTraitRef, PolyFnSig, PolyGenSig, PolyTraitRef,
diff --git a/compiler/rustc_middle/src/ty/structural_impls.rs b/compiler/rustc_middle/src/ty/structural_impls.rs
index e223ffd7c5d..971acda33e2 100644
--- a/compiler/rustc_middle/src/ty/structural_impls.rs
+++ b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -202,34 +202,6 @@ impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for AliasTy<'tcx> {
     }
 }
 
-impl fmt::Debug for ty::InferConst {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            InferConst::Var(var) => write!(f, "{var:?}"),
-            InferConst::EffectVar(var) => write!(f, "{var:?}"),
-            InferConst::Fresh(var) => write!(f, "Fresh({var:?})"),
-        }
-    }
-}
-impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for ty::InferConst {
-    fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>(
-        this: WithInfcx<'_, Infcx, &Self>,
-        f: &mut core::fmt::Formatter<'_>,
-    ) -> core::fmt::Result {
-        use ty::InferConst::*;
-        match this.infcx.universe_of_ct(*this.data) {
-            None => write!(f, "{:?}", this.data),
-            Some(universe) => match *this.data {
-                Var(vid) => write!(f, "?{}_{}c", vid.index(), universe.index()),
-                EffectVar(vid) => write!(f, "?{}_{}e", vid.index(), universe.index()),
-                Fresh(_) => {
-                    unreachable!()
-                }
-            },
-        }
-    }
-}
-
 impl<'tcx> fmt::Debug for ty::consts::Expr<'tcx> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         WithInfcx::with_no_infcx(self).fmt(f)
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index b22ff5c57c3..ea0e179c00d 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -1609,24 +1609,6 @@ impl fmt::Debug for EarlyParamRegion {
 }
 
 rustc_index::newtype_index! {
-    /// A **`const`** **v**ariable **ID**.
-    #[debug_format = "?{}c"]
-    pub struct ConstVid {}
-}
-
-rustc_index::newtype_index! {
-    /// An **effect** **v**ariable **ID**.
-    ///
-    /// Handling effect infer variables happens separately from const infer variables
-    /// because we do not want to reuse any of the const infer machinery. If we try to
-    /// relate an effect variable with a normal one, we would ICE, which can catch bugs
-    /// where we are not correctly using the effect var for an effect param. Fallback
-    /// is also implemented on top of having separate effect and normal const variables.
-    #[debug_format = "?{}e"]
-    pub struct EffectVid {}
-}
-
-rustc_index::newtype_index! {
     /// A **region** (lifetime) **v**ariable **ID**.
     #[derive(HashStable)]
     #[debug_format = "'?{}"]