mir constants: type traversing bye bye

compiler/rustc_middle/src/ty/fold.rs

@@ -42,7 +42,6 @@
 //!     - ty.super_fold_with(folder)
 //! - u.fold_with(folder)
 //! ```
-use crate::mir;
 use crate::ty::{self, Binder, BoundTy, Ty, TyCtxt, TypeVisitable};
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_hir::def_id::DefId;
@@ -134,20 +133,9 @@ pub trait TypeFolder<'tcx>: FallibleTypeFolder<'tcx, Error = !> {
         uv.super_fold_with(self)
     }
 
-    fn fold_mir_unevaluated(
-        &mut self,
-        uv: mir::UnevaluatedConst<'tcx>,
-    ) -> mir::UnevaluatedConst<'tcx> {
-        uv.super_fold_with(self)
-    }
-
     fn fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> ty::Predicate<'tcx> {
         p.super_fold_with(self)
     }
-
-    fn fold_mir_const(&mut self, c: mir::ConstantKind<'tcx>) -> mir::ConstantKind<'tcx> {
-        bug!("most type folders should not be folding MIR datastructures: {:?}", c)
-    }
 }
 
 /// This trait is implemented for every folding traversal. There is a fold
@@ -188,26 +176,12 @@ pub trait FallibleTypeFolder<'tcx>: Sized {
         c.try_super_fold_with(self)
     }
 
-    fn try_fold_mir_unevaluated(
-        &mut self,
-        c: mir::UnevaluatedConst<'tcx>,
-    ) -> Result<mir::UnevaluatedConst<'tcx>, Self::Error> {
-        c.try_super_fold_with(self)
-    }
-
     fn try_fold_predicate(
         &mut self,
         p: ty::Predicate<'tcx>,
     ) -> Result<ty::Predicate<'tcx>, Self::Error> {
         p.try_super_fold_with(self)
     }
-
-    fn try_fold_mir_const(
-        &mut self,
-        c: mir::ConstantKind<'tcx>,
-    ) -> Result<mir::ConstantKind<'tcx>, Self::Error> {
-        bug!("most type folders should not be folding MIR datastructures: {:?}", c)
-    }
 }
 
 // This blanket implementation of the fallible trait for infallible folders
@@ -248,23 +222,9 @@ where
         Ok(self.fold_ty_unevaluated(c))
     }
 
-    fn try_fold_mir_unevaluated(
-        &mut self,
-        c: mir::UnevaluatedConst<'tcx>,
-    ) -> Result<mir::UnevaluatedConst<'tcx>, !> {
-        Ok(self.fold_mir_unevaluated(c))
-    }
-
     fn try_fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> Result<ty::Predicate<'tcx>, !> {
         Ok(self.fold_predicate(p))
     }
-
-    fn try_fold_mir_const(
-        &mut self,
-        c: mir::ConstantKind<'tcx>,
-    ) -> Result<mir::ConstantKind<'tcx>, !> {
-        Ok(self.fold_mir_const(c))
-    }
 }
 
 ///////////////////////////////////////////////////////////////////////////