Rename TypeFolderFallible to FallibleTypeFolder

compiler/rustc_infer/src/infer/resolve.rs

@@ -1,7 +1,7 @@
 use super::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use super::{FixupError, FixupResult, InferCtxt, Span};
 use rustc_middle::mir;
-use rustc_middle::ty::fold::{TypeFolder, TypeFolderFallible, TypeVisitor};
+use rustc_middle::ty::fold::{FallibleTypeFolder, TypeFolder, TypeVisitor};
 use rustc_middle::ty::{self, Const, InferConst, Ty, TyCtxt, TypeFoldable};
 
 use std::ops::ControlFlow;
@@ -192,7 +192,7 @@ impl<'a, 'tcx> TypeFolder<'tcx> for FullTypeResolver<'a, 'tcx> {
     }
 }
 
-impl<'a, 'tcx> TypeFolderFallible<'tcx> for FullTypeResolver<'a, 'tcx> {
+impl<'a, 'tcx> FallibleTypeFolder<'tcx> for FullTypeResolver<'a, 'tcx> {
     fn try_fold_ty(&mut self, t: Ty<'tcx>) -> Result<Ty<'tcx>, Self::Error> {
         if !t.needs_infer() {
             Ok(t) // micro-optimize -- if there is nothing in this type that this fold affects...

compiler/rustc_infer/src/traits/structural_impls.rs

@@ -1,7 +1,7 @@
 use crate::traits;
 use crate::traits::project::Normalized;
 use rustc_middle::ty;
-use rustc_middle::ty::fold::{TypeFoldable, TypeFolderFallible, TypeVisitor};
+use rustc_middle::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeVisitor};
 
 use std::fmt;
 use std::ops::ControlFlow;
@@ -60,7 +60,7 @@ impl<'tcx> fmt::Debug for traits::MismatchedProjectionTypes<'tcx> {
 // TypeFoldable implementations.
 
 impl<'tcx, O: TypeFoldable<'tcx>> TypeFoldable<'tcx> for traits::Obligation<'tcx, O> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {

compiler/rustc_macros/src/type_foldable.rs

@@ -25,7 +25,7 @@ pub fn type_foldable_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::
     s.bound_impl(
         quote!(::rustc_middle::ty::fold::TypeFoldable<'tcx>),
         quote! {
-            fn try_super_fold_with<__F: ::rustc_middle::ty::fold::TypeFolderFallible<'tcx>>(
+            fn try_super_fold_with<__F: ::rustc_middle::ty::fold::FallibleTypeFolder<'tcx>>(
                 self,
                 __folder: &mut __F
             ) -> Result<Self, __F::Error> {

compiler/rustc_middle/src/macros.rs

@@ -52,7 +52,7 @@ macro_rules! TrivialTypeFoldableImpls {
     (for <$tcx:lifetime> { $($ty:ty,)+ }) => {
         $(
             impl<$tcx> $crate::ty::fold::TypeFoldable<$tcx> for $ty {
-                fn try_super_fold_with<F: $crate::ty::fold::TypeFolderFallible<$tcx>>(
+                fn try_super_fold_with<F: $crate::ty::fold::FallibleTypeFolder<$tcx>>(
                     self,
                     _: &mut F
                 ) -> ::std::result::Result<$ty, F::Error> {
@@ -95,7 +95,7 @@ macro_rules! EnumTypeFoldableImpl {
         impl<$($p),*> $crate::ty::fold::TypeFoldable<$tcx> for $s
             $(where $($wc)*)*
         {
-            fn try_super_fold_with<V: $crate::ty::fold::TypeFolderFallible<$tcx>>(
+            fn try_super_fold_with<V: $crate::ty::fold::FallibleTypeFolder<$tcx>>(
                 self,
                 folder: &mut V,
             ) -> ::std::result::Result<Self, V::Error> {

compiler/rustc_middle/src/mir/mod.rs

@@ -7,7 +7,7 @@ use crate::mir::interpret::{Allocation, ConstValue, GlobalAlloc, Scalar};
 use crate::mir::visit::MirVisitable;
 use crate::ty::adjustment::PointerCast;
 use crate::ty::codec::{TyDecoder, TyEncoder};
-use crate::ty::fold::{TypeFoldable, TypeFolderFallible, TypeVisitor};
+use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeVisitor};
 use crate::ty::print::{FmtPrinter, Printer};
 use crate::ty::subst::{Subst, SubstsRef};
 use crate::ty::{self, List, Ty, TyCtxt};
@@ -2760,7 +2760,7 @@ impl UserTypeProjection {
 TrivialTypeFoldableAndLiftImpls! { ProjectionKind, }
 
 impl<'tcx> TypeFoldable<'tcx> for UserTypeProjection {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {

compiler/rustc_middle/src/mir/type_foldable.rs

@@ -16,7 +16,7 @@ TrivialTypeFoldableAndLiftImpls! {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -148,7 +148,7 @@ impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for GeneratorKind {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
         Ok(self)
     }
 
@@ -158,7 +158,7 @@ impl<'tcx> TypeFoldable<'tcx> for GeneratorKind {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for Place<'tcx> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -175,7 +175,7 @@ impl<'tcx> TypeFoldable<'tcx> for Place<'tcx> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<PlaceElem<'tcx>> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -188,7 +188,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<PlaceElem<'tcx>> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for Rvalue<'tcx> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -292,7 +292,7 @@ impl<'tcx> TypeFoldable<'tcx> for Rvalue<'tcx> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for Operand<'tcx> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -312,7 +312,7 @@ impl<'tcx> TypeFoldable<'tcx> for Operand<'tcx> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for PlaceElem<'tcx> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -345,7 +345,7 @@ impl<'tcx> TypeFoldable<'tcx> for PlaceElem<'tcx> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for Field {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
         Ok(self)
     }
     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
@@ -354,7 +354,7 @@ impl<'tcx> TypeFoldable<'tcx> for Field {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for GeneratorSavedLocal {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
         Ok(self)
     }
     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
@@ -363,7 +363,7 @@ impl<'tcx> TypeFoldable<'tcx> for GeneratorSavedLocal {
 }
 
 impl<'tcx, R: Idx, C: Idx> TypeFoldable<'tcx> for BitMatrix<R, C> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
         Ok(self)
     }
     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
@@ -372,7 +372,7 @@ impl<'tcx, R: Idx, C: Idx> TypeFoldable<'tcx> for BitMatrix<R, C> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for Constant<'tcx> {
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {
@@ -390,11 +390,11 @@ impl<'tcx> TypeFoldable<'tcx> for Constant<'tcx> {
 
 impl<'tcx> TypeFoldable<'tcx> for ConstantKind<'tcx> {
     #[inline(always)]
-    fn try_fold_with<F: TypeFolderFallible<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+    fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
         folder.try_fold_mir_const(self)
     }
 
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {

compiler/rustc_middle/src/ty/fold.rs

@@ -63,12 +63,12 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
         self.try_fold_with(folder).into_ok()
     }
 
-    fn try_super_fold_with<F: TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error>;
 
-    fn try_fold_with<F: TypeFolderFallible<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+    fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
         self.try_super_fold_with(folder)
     }
 
@@ -216,8 +216,8 @@ impl TypeFoldable<'tcx> for hir::Constness {
 ///
 /// If this folder is fallible (and therefore its [`Error`][`TypeFolder::Error`]
 /// associated type is something other than the default, never),
-/// [`TypeFolderFallible`] should be implemented manually; otherwise,
-/// a blanket implementation of [`TypeFolderFallible`] will defer to
+/// [`FallibleTypeFolder`] should be implemented manually; otherwise,
+/// a blanket implementation of [`FallibleTypeFolder`] will defer to
 /// the infallible methods of this trait to ensure that the two APIs
 /// are coherent.
 pub trait TypeFolder<'tcx>: Sized {
@@ -269,7 +269,7 @@ pub trait TypeFolder<'tcx>: Sized {
     }
 }
 
-/// The `TypeFolderFallible` trait defines the actual *folding*. There is a
+/// The `FallibleTypeFolder` trait defines the actual *folding*. There is a
 /// method defined for every foldable type. Each of these has a
 /// default implementation that does an "identity" fold. Within each
 /// identity fold, it should invoke `foo.try_fold_with(self)` to fold each
@@ -278,7 +278,7 @@ pub trait TypeFolder<'tcx>: Sized {
 /// A blanket implementation of this trait (that defers to the relevant
 /// method of [`TypeFolder`]) is provided for all infallible folders in
 /// order to ensure the two APIs are coherent.
-pub trait TypeFolderFallible<'tcx>: TypeFolder<'tcx> {
+pub trait FallibleTypeFolder<'tcx>: TypeFolder<'tcx> {
     fn try_fold_binder<T>(&mut self, t: Binder<'tcx, T>) -> Result<Binder<'tcx, T>, Self::Error>
     where
         T: TypeFoldable<'tcx>,
@@ -318,7 +318,7 @@ pub trait TypeFolderFallible<'tcx>: TypeFolder<'tcx> {
 
 // Blanket implementation of fallible trait for infallible folders
 // delegates to infallible methods to prevent incoherence
-impl<'tcx, F> TypeFolderFallible<'tcx> for F
+impl<'tcx, F> FallibleTypeFolder<'tcx> for F
 where
     F: TypeFolder<'tcx, Error = !>,
 {

compiler/rustc_middle/src/ty/mod.rs

@@ -9,7 +9,7 @@
 //!
 //! ["The `ty` module: representing types"]: https://rustc-dev-guide.rust-lang.org/ty.html
 
-pub use self::fold::{TypeFoldable, TypeFolder, TypeFolderFallible, TypeVisitor};
+pub use self::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder, TypeVisitor};
 pub use self::AssocItemContainer::*;
 pub use self::BorrowKind::*;
 pub use self::IntVarValue::*;
@@ -1269,7 +1269,7 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for ParamEnv<'tcx> {
 }
 
 impl<'tcx> TypeFoldable<'tcx> for ParamEnv<'tcx> {
-    fn try_super_fold_with<F: ty::fold::TypeFolderFallible<'tcx>>(
+    fn try_super_fold_with<F: ty::fold::FallibleTypeFolder<'tcx>>(
         self,
         folder: &mut F,
     ) -> Result<Self, F::Error> {