Fix tools

compiler/rustc_codegen_cranelift/src/base.rs

@@ -964,7 +964,9 @@ pub(crate) fn codegen_place<'tcx>(
                 cplace = cplace.place_deref(fx);
             }
             PlaceElem::OpaqueCast(ty) => bug!("encountered OpaqueCast({ty}) in codegen"),
-            PlaceElem::Subtype(ty) => cplace = cplace.place_transmute_type(fx, fx.monomorphize(ty)),
+            PlaceElem::Subtype(ty) | PlaceElem::UnsafeBinderCast(_, ty) => {
+                cplace = cplace.place_transmute_type(fx, fx.monomorphize(ty));
+            }
             PlaceElem::Field(field, _ty) => {
                 cplace = cplace.place_field(fx, field);
             }

src/librustdoc/clean/mod.rs

@@ -1855,6 +1855,9 @@ pub(crate) fn clean_ty<'tcx>(ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> T
             DynTrait(bounds, lifetime)
         }
         TyKind::BareFn(barefn) => BareFunction(Box::new(clean_bare_fn_ty(barefn, cx))),
+        TyKind::UnsafeBinder(unsafe_binder_ty) => {
+            UnsafeBinder(Box::new(clean_unsafe_binder_ty(unsafe_binder_ty, cx)))
+        }
         // Rustdoc handles `TyKind::Err`s by turning them into `Type::Infer`s.
         TyKind::Infer | TyKind::Err(_) | TyKind::Typeof(..) | TyKind::InferDelegation(..) => Infer,
         TyKind::AnonAdt(..) => {
@@ -2080,6 +2083,11 @@ pub(crate) fn clean_middle_ty<'tcx>(
                 abi: sig.abi(),
             }))
         }
+        ty::UnsafeBinder(inner) => {
+            let generic_params = clean_bound_vars(inner.bound_vars());
+            let ty = clean_middle_ty(inner.into(), cx, None, None);
+            UnsafeBinder(Box::new(UnsafeBinderTy { generic_params, ty }))
+        }
         ty::Adt(def, args) => {
             let did = def.did();
             let kind = match def.adt_kind() {
@@ -2577,6 +2585,21 @@ fn clean_bare_fn_ty<'tcx>(
     BareFunctionDecl { safety: bare_fn.safety, abi: bare_fn.abi, decl, generic_params }
 }
 
+fn clean_unsafe_binder_ty<'tcx>(
+    unsafe_binder_ty: &hir::UnsafeBinderTy<'tcx>,
+    cx: &mut DocContext<'tcx>,
+) -> UnsafeBinderTy {
+    // NOTE: generics must be cleaned before args
+    let generic_params = unsafe_binder_ty
+        .generic_params
+        .iter()
+        .filter(|p| !is_elided_lifetime(p))
+        .map(|x| clean_generic_param(cx, None, x))
+        .collect();
+    let ty = clean_ty(unsafe_binder_ty.inner_ty, cx);
+    UnsafeBinderTy { generic_params, ty }
+}
+
 pub(crate) fn reexport_chain(
     tcx: TyCtxt<'_>,
     import_def_id: LocalDefId,

src/librustdoc/clean/types.rs

@@ -37,7 +37,7 @@ use {rustc_ast as ast, rustc_hir as hir};
 pub(crate) use self::ItemKind::*;
 pub(crate) use self::Type::{
     Array, BareFunction, BorrowedRef, DynTrait, Generic, ImplTrait, Infer, Primitive, QPath,
-    RawPointer, SelfTy, Slice, Tuple,
+    RawPointer, SelfTy, Slice, Tuple, UnsafeBinder,
 };
 use crate::clean::cfg::Cfg;
 use crate::clean::clean_middle_path;
@@ -1503,6 +1503,8 @@ pub(crate) enum Type {
 
     /// An `impl Trait`: `impl TraitA + TraitB + ...`
     ImplTrait(Vec<GenericBound>),
+
+    UnsafeBinder(Box<UnsafeBinderTy>),
 }
 
 impl Type {
@@ -1695,7 +1697,7 @@ impl Type {
             Type::Pat(..) => PrimitiveType::Pat,
             RawPointer(..) => PrimitiveType::RawPointer,
             QPath(box QPathData { ref self_type, .. }) => return self_type.def_id(cache),
-            Generic(_) | SelfTy | Infer | ImplTrait(_) => return None,
+            Generic(_) | SelfTy | Infer | ImplTrait(_) | UnsafeBinder(_) => return None,
         };
         Primitive(t).def_id(cache)
     }
@@ -2335,6 +2337,12 @@ pub(crate) struct BareFunctionDecl {
     pub(crate) abi: Abi,
 }
 
+#[derive(Clone, PartialEq, Eq, Debug, Hash)]
+pub(crate) struct UnsafeBinderTy {
+    pub(crate) generic_params: Vec<GenericParamDef>,
+    pub(crate) ty: Type,
+}
+
 #[derive(Clone, Debug)]
 pub(crate) struct Static {
     pub(crate) type_: Box<Type>,

src/librustdoc/html/format.rs

@@ -1035,6 +1035,11 @@ fn fmt_type(
             }
             decl.decl.print(cx).fmt(f)
         }
+        clean::UnsafeBinder(ref binder) => {
+            // FIXME(unsafe_binders): This should print `unsafe<...>`
+            print_higher_ranked_params_with_space(&binder.generic_params, cx).fmt(f)?;
+            binder.ty.print(cx).fmt(f)
+        }
         clean::Tuple(ref typs) => match &typs[..] {
             &[] => primitive_link(f, PrimitiveType::Unit, format_args!("()"), cx),
             [one] => {

src/librustdoc/html/render/search_index.rs

@@ -822,7 +822,8 @@ fn get_index_type_id(
         | clean::Generic(_)
         | clean::SelfTy
         | clean::ImplTrait(_)
-        | clean::Infer => None,
+        | clean::Infer
+        | clean::UnsafeBinder(_) => None,
     }
 }
 

src/librustdoc/json/conversions.rs

@@ -576,7 +576,7 @@ impl FromWithTcx<clean::Type> for Type {
     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
         use clean::Type::{
             Array, BareFunction, BorrowedRef, Generic, ImplTrait, Infer, Primitive, QPath,
-            RawPointer, SelfTy, Slice, Tuple,
+            RawPointer, SelfTy, Slice, Tuple, UnsafeBinder,
         };
 
         match ty {
@@ -614,6 +614,8 @@ impl FromWithTcx<clean::Type> for Type {
                 self_type: Box::new(self_type.into_tcx(tcx)),
                 trait_: trait_.map(|trait_| trait_.into_tcx(tcx)),
             },
+            // FIXME(unsafe_binder): Implement rustdoc-json.
+            UnsafeBinder(_) => todo!(),
         }
     }
 }

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -506,6 +506,7 @@ impl<'a, 'tcx> LinkCollector<'a, 'tcx> {
             | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
             | ty::CoroutineWitness(..)
+            | ty::UnsafeBinder(..)
             | ty::Dynamic(..)
             | ty::Param(_)
             | ty::Bound(..)

src/tools/clippy/clippy_lints/src/dereference.rs

@@ -823,7 +823,8 @@ impl TyCoercionStability {
                 | TyKind::Pat(..)
                 | TyKind::Never
                 | TyKind::Tup(_)
-                | TyKind::Path(_) => Self::Deref,
+                | TyKind::Path(_)
+                | TyKind::UnsafeBinder(..) => Self::Deref,
                 TyKind::OpaqueDef(..)
                 | TyKind::Infer
                 | TyKind::Typeof(..)
@@ -884,7 +885,8 @@ impl TyCoercionStability {
                 | ty::CoroutineClosure(..)
                 | ty::Never
                 | ty::Tuple(_)
-                | ty::Alias(ty::Projection, _) => Self::Deref,
+                | ty::Alias(ty::Projection, _)
+                | ty::UnsafeBinder(_) => Self::Deref,
             };
         }
     }

src/tools/clippy/clippy_lints/src/loops/never_loop.rs

@@ -153,6 +153,7 @@ fn never_loop_expr<'tcx>(
         ExprKind::Unary(_, e)
         | ExprKind::Cast(e, _)
         | ExprKind::Type(e, _)
+        | ExprKind::UnsafeBinderCast(_, e, _)
         | ExprKind::Field(e, _)
         | ExprKind::AddrOf(_, _, e)
         | ExprKind::Repeat(e, _)

src/tools/clippy/clippy_lints/src/utils/author.rs

@@ -626,6 +626,10 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
                 kind!("DropTemps({expr})");
                 self.expr(expr);
             },
+            ExprKind::UnsafeBinderCast(..) => {
+                // FIXME(unsafe_binders): Implement this.
+                todo!()
+            }
         }
     }
 

src/tools/clippy/clippy_utils/src/eager_or_lazy.rs

@@ -294,6 +294,7 @@ fn expr_eagerness<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> EagernessS
                 | ExprKind::Lit(_)
                 | ExprKind::Cast(..)
                 | ExprKind::Type(..)
+                | ExprKind::UnsafeBinderCast(..)
                 | ExprKind::DropTemps(_)
                 | ExprKind::Let(..)
                 | ExprKind::If(..)

src/tools/clippy/clippy_utils/src/hir_utils.rs

@@ -347,6 +347,10 @@ impl HirEqInterExpr<'_, '_, '_> {
             },
             (&ExprKind::Tup(l_tup), &ExprKind::Tup(r_tup)) => self.eq_exprs(l_tup, r_tup),
             (&ExprKind::Type(le, lt), &ExprKind::Type(re, rt)) => self.eq_expr(le, re) && self.eq_ty(lt, rt),
+            (&ExprKind::UnsafeBinderCast(lkind, le, None), &ExprKind::UnsafeBinderCast(rkind, re, None)) =>
+                lkind == rkind && self.eq_expr(le, re),
+            (&ExprKind::UnsafeBinderCast(lkind, le, Some(lt)), &ExprKind::UnsafeBinderCast(rkind, re, Some(rt))) =>
+                lkind == rkind && self.eq_expr(le, re) && self.eq_ty(lt, rt),
             (&ExprKind::Unary(l_op, le), &ExprKind::Unary(r_op, re)) => l_op == r_op && self.eq_expr(le, re),
             (&ExprKind::Yield(le, _), &ExprKind::Yield(re, _)) => return self.eq_expr(le, re),
             (
@@ -381,6 +385,7 @@ impl HirEqInterExpr<'_, '_, '_> {
                 | &ExprKind::Type(..)
                 | &ExprKind::Unary(..)
                 | &ExprKind::Yield(..)
+                | &ExprKind::UnsafeBinderCast(..)
 
                 // --- Special cases that do not have a positive branch.
 
@@ -928,6 +933,13 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
                 std::mem::discriminant(&lop).hash(&mut self.s);
                 self.hash_expr(le);
             },
+            ExprKind::UnsafeBinderCast(kind, e, t) => {
+                std::mem::discriminant(&kind).hash(&mut self.s);
+                self.hash_expr(e);
+                if let Some(t) = t {
+                    self.hash_ty(t);
+                }
+            }
             ExprKind::Err(_) => {},
         }
     }
@@ -1125,6 +1137,10 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
             TyKind::Typeof(anon_const) => {
                 self.hash_body(anon_const.body);
             },
+            TyKind::UnsafeBinder(binder) => {
+                // FIXME(unsafe_binder): Hash generics...
+                self.hash_ty(binder.inner_ty);
+            }
             TyKind::Err(_) | TyKind::Infer | TyKind::Never | TyKind::InferDelegation(..) | TyKind::AnonAdt(_) => {},
         }
     }

src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs

@@ -286,7 +286,8 @@ fn check_place<'tcx>(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &B
             | ProjectionElem::Downcast(..)
             | ProjectionElem::Subslice { .. }
             | ProjectionElem::Subtype(_)
-            | ProjectionElem::Index(_) => {},
+            | ProjectionElem::Index(_)
+            | ProjectionElem::UnsafeBinderCast(..) => {},
         }
     }
 

src/tools/clippy/clippy_utils/src/sugg.rs

@@ -151,6 +151,7 @@ impl<'a> Sugg<'a> {
             | ExprKind::Become(..)
             | ExprKind::Struct(..)
             | ExprKind::Tup(..)
+            | ExprKind::UnsafeBinderCast(..)
             | ExprKind::Err(_) => Sugg::NonParen(get_snippet(expr.span)),
             ExprKind::DropTemps(inner) => Self::hir_from_snippet(inner, get_snippet),
             ExprKind::Assign(lhs, rhs, _) => {
@@ -223,6 +224,7 @@ impl<'a> Sugg<'a> {
             | ast::ExprKind::Array(..)
             | ast::ExprKind::While(..)
             | ast::ExprKind::Await(..)
+            | ast::ExprKind::UnsafeBinderCast(..)
             | ast::ExprKind::Err(_)
             | ast::ExprKind::Dummy => Sugg::NonParen(snippet_with_context(cx, expr.span, ctxt, default, app).0),
             ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::HalfOpen) => Sugg::BinOp(

src/tools/clippy/clippy_utils/src/visitors.rs

@@ -686,6 +686,9 @@ pub fn for_each_unconsumed_temporary<'tcx, B>(
             ExprKind::Type(e, _) => {
                 helper(typeck, consume, e, f)?;
             },
+            ExprKind::UnsafeBinderCast(_, e, _) => {
+                helper(typeck, consume, e, f)?;
+            },
 
             // Either drops temporaries, jumps out of the current expression, or has no sub expression.
             ExprKind::DropTemps(_)

src/tools/rustfmt/src/expr.rs

@@ -407,7 +407,8 @@ pub(crate) fn format_expr(
         ast::ExprKind::FormatArgs(..)
         | ast::ExprKind::Type(..)
         | ast::ExprKind::IncludedBytes(..)
-        | ast::ExprKind::OffsetOf(..) => {
+        | ast::ExprKind::OffsetOf(..)
+        | ast::ExprKind::UnsafeBinderCast(..) => {
             // These don't normally occur in the AST because macros aren't expanded. However,
             // rustfmt tries to parse macro arguments when formatting macros, so it's not totally
             // impossible for rustfmt to come across one of these nodes when formatting a file.

src/tools/rustfmt/src/types.rs

@@ -895,6 +895,25 @@ impl Rewrite for ast::Ty {
                 let pat = pat.rewrite(context, shape)?;
                 Some(format!("{ty} is {pat}"))
             }
+            ast::TyKind::UnsafeBinder(ref binder) => {
+                let mut result = String::new()
+                ;
+                if let Some(ref lifetime_str) = rewrite_bound_params(context, shape, &binder.generic_params) {
+                    result.push_str("unsafe<");
+                    result.push_str(lifetime_str);
+                    result.push_str("> ");
+                }
+
+                let inner_ty_shape = if context.use_block_indent() {
+                    shape.offset_left(result.len())?
+                } else {
+                    shape.visual_indent(result.len()).sub_width(result.len())?
+                };
+
+                let rewrite = binder.inner_ty.rewrite(context, inner_ty_shape)?;
+                result.push_str(&rewrite);
+                Some(result)
+            }
         }
     }
 }

src/tools/rustfmt/src/utils.rs

@@ -497,6 +497,7 @@ pub(crate) fn is_block_expr(context: &RewriteContext<'_>, expr: &ast::Expr, repr
         | ast::ExprKind::Await(..)
         | ast::ExprKind::Break(..)
         | ast::ExprKind::Cast(..)
+        | ast::ExprKind::UnsafeBinderCast(..)
         | ast::ExprKind::Continue(..)
         | ast::ExprKind::Dummy
         | ast::ExprKind::Err(_)