Rollup merge of #139961 - nnethercote:two-rustc_const_eval-cleanups, r=oli-obk

Two `rustc_const_eval` cleanups

r? ``@lcnr``

compiler/rustc_const_eval/src/check_consts/check.rs

@@ -34,7 +34,7 @@ use crate::check_consts::is_fn_or_trait_safe_to_expose_on_stable;
 use crate::errors;
 
 type QualifResults<'mir, 'tcx, Q> =
-    rustc_mir_dataflow::ResultsCursor<'mir, 'tcx, FlowSensitiveAnalysis<'mir, 'mir, 'tcx, Q>>;
+    rustc_mir_dataflow::ResultsCursor<'mir, 'tcx, FlowSensitiveAnalysis<'mir, 'tcx, Q>>;
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 enum ConstConditionsHold {

compiler/rustc_const_eval/src/check_consts/resolver.rs

@@ -22,17 +22,17 @@ use super::{ConstCx, Qualif, qualifs};
 /// qualified immediately after it is borrowed or its address escapes. The borrow must allow for
 /// mutation, which includes shared borrows of places with interior mutability. The type of
 /// borrowed place must contain the qualif.
-struct TransferFunction<'a, 'mir, 'tcx, Q> {
-    ccx: &'a ConstCx<'mir, 'tcx>,
-    state: &'a mut State,
+struct TransferFunction<'mir, 'tcx, Q> {
+    ccx: &'mir ConstCx<'mir, 'tcx>,
+    state: &'mir mut State,
     _qualif: PhantomData<Q>,
 }
 
-impl<'a, 'mir, 'tcx, Q> TransferFunction<'a, 'mir, 'tcx, Q>
+impl<'mir, 'tcx, Q> TransferFunction<'mir, 'tcx, Q>
 where
     Q: Qualif,
 {
-    fn new(ccx: &'a ConstCx<'mir, 'tcx>, state: &'a mut State) -> Self {
+    fn new(ccx: &'mir ConstCx<'mir, 'tcx>, state: &'mir mut State) -> Self {
         TransferFunction { ccx, state, _qualif: PhantomData }
     }
 
@@ -124,7 +124,7 @@ where
     }
 }
 
-impl<'tcx, Q> Visitor<'tcx> for TransferFunction<'_, '_, 'tcx, Q>
+impl<'tcx, Q> Visitor<'tcx> for TransferFunction<'_, 'tcx, Q>
 where
     Q: Qualif,
 {
@@ -228,20 +228,20 @@ where
 }
 
 /// The dataflow analysis used to propagate qualifs on arbitrary CFGs.
-pub(super) struct FlowSensitiveAnalysis<'a, 'mir, 'tcx, Q> {
-    ccx: &'a ConstCx<'mir, 'tcx>,
+pub(super) struct FlowSensitiveAnalysis<'mir, 'tcx, Q> {
+    ccx: &'mir ConstCx<'mir, 'tcx>,
     _qualif: PhantomData<Q>,
 }
 
-impl<'a, 'mir, 'tcx, Q> FlowSensitiveAnalysis<'a, 'mir, 'tcx, Q>
+impl<'mir, 'tcx, Q> FlowSensitiveAnalysis<'mir, 'tcx, Q>
 where
     Q: Qualif,
 {
-    pub(super) fn new(_: Q, ccx: &'a ConstCx<'mir, 'tcx>) -> Self {
+    pub(super) fn new(_: Q, ccx: &'mir ConstCx<'mir, 'tcx>) -> Self {
         FlowSensitiveAnalysis { ccx, _qualif: PhantomData }
     }
 
-    fn transfer_function(&self, state: &'a mut State) -> TransferFunction<'a, 'mir, 'tcx, Q> {
+    fn transfer_function(&self, state: &'mir mut State) -> TransferFunction<'mir, 'tcx, Q> {
         TransferFunction::<Q>::new(self.ccx, state)
     }
 }
@@ -313,7 +313,7 @@ impl JoinSemiLattice for State {
     }
 }
 
-impl<'tcx, Q> Analysis<'tcx> for FlowSensitiveAnalysis<'_, '_, 'tcx, Q>
+impl<'tcx, Q> Analysis<'tcx> for FlowSensitiveAnalysis<'_, 'tcx, Q>
 where
     Q: Qualif,
 {

compiler/rustc_const_eval/src/interpret/intern.rs

@@ -30,6 +30,7 @@ use super::{
     AllocId, Allocation, InterpCx, MPlaceTy, Machine, MemoryKind, PlaceTy, err_ub, interp_ok,
 };
 use crate::const_eval;
+use crate::const_eval::DummyMachine;
 use crate::errors::NestedStaticInThreadLocal;
 
 pub trait CompileTimeMachine<'tcx, T> = Machine<
@@ -323,14 +324,17 @@ pub fn intern_const_alloc_for_constprop<'tcx, T, M: CompileTimeMachine<'tcx, T>>
     interp_ok(())
 }
 
-impl<'tcx, M: super::intern::CompileTimeMachine<'tcx, !>> InterpCx<'tcx, M> {
+impl<'tcx> InterpCx<'tcx, DummyMachine> {
     /// A helper function that allocates memory for the layout given and gives you access to mutate
     /// it. Once your own mutation code is done, the backing `Allocation` is removed from the
     /// current `Memory` and interned as read-only into the global memory.
     pub fn intern_with_temp_alloc(
         &mut self,
         layout: TyAndLayout<'tcx>,
-        f: impl FnOnce(&mut InterpCx<'tcx, M>, &PlaceTy<'tcx, M::Provenance>) -> InterpResult<'tcx, ()>,
+        f: impl FnOnce(
+            &mut InterpCx<'tcx, DummyMachine>,
+            &PlaceTy<'tcx, CtfeProvenance>,
+        ) -> InterpResult<'tcx, ()>,
     ) -> InterpResult<'tcx, AllocId> {
         // `allocate` picks a fresh AllocId that we will associate with its data below.
         let dest = self.allocate(layout, MemoryKind::Stack)?;