rustc: add lang items "const_slice_ptr" and "mut_slice_ptr"

Add lang items for methods on raw slices.

Author: neocturne

src/librustc_hir/lang_items.rs

@@ -135,6 +135,8 @@ language_item_table! {
     SliceU8AllocImplItem,        "slice_u8_alloc",     slice_u8_alloc_impl,     Target::Impl;
     ConstPtrImplItem,            "const_ptr",          const_ptr_impl,          Target::Impl;
     MutPtrImplItem,              "mut_ptr",            mut_ptr_impl,            Target::Impl;
+    ConstSlicePtrImplItem,       "const_slice_ptr",    const_slice_ptr_impl,    Target::Impl;
+    MutSlicePtrImplItem,         "mut_slice_ptr",      mut_slice_ptr_impl,      Target::Impl;
     I8ImplItem,                  "i8",                 i8_impl,                 Target::Impl;
     I16ImplItem,                 "i16",                i16_impl,                Target::Impl;
     I32ImplItem,                 "i32",                i32_impl,                Target::Impl;

src/librustc_typeck/check/method/probe.rs

@@ -649,11 +649,16 @@ impl<'a, 'tcx> ProbeContext<'a, 'tcx> {
                 }
             }
             ty::RawPtr(ty::TypeAndMut { ty: _, mutbl }) => {
-                let lang_def_id = match mutbl {
-                    hir::Mutability::Not => lang_items.const_ptr_impl(),
-                    hir::Mutability::Mut => lang_items.mut_ptr_impl(),
+                let (lang_def_id1, lang_def_id2) = match mutbl {
+                    hir::Mutability::Not => {
+                        (lang_items.const_ptr_impl(), lang_items.const_slice_ptr_impl())
+                    }
+                    hir::Mutability::Mut => {
+                        (lang_items.mut_ptr_impl(), lang_items.mut_slice_ptr_impl())
+                    }
                 };
-                self.assemble_inherent_impl_for_primitive(lang_def_id);
+                self.assemble_inherent_impl_for_primitive(lang_def_id1);
+                self.assemble_inherent_impl_for_primitive(lang_def_id2);
             }
             ty::Int(i) => {
                 let lang_def_id = match i {

src/librustc_typeck/coherence/inherent_impls.rs

@@ -112,6 +112,30 @@ impl ItemLikeVisitor<'v> for InherentCollect<'tcx> {
                     item.span,
                 );
             }
+            ty::RawPtr(ty::TypeAndMut { ty: inner, mutbl: hir::Mutability::Not })
+                if matches!(inner.kind, ty::Slice(_)) =>
+            {
+                self.check_primitive_impl(
+                    def_id,
+                    lang_items.const_slice_ptr_impl(),
+                    None,
+                    "const_slice_ptr",
+                    "*const [T]",
+                    item.span,
+                );
+            }
+            ty::RawPtr(ty::TypeAndMut { ty: inner, mutbl: hir::Mutability::Mut })
+                if matches!(inner.kind, ty::Slice(_)) =>
+            {
+                self.check_primitive_impl(
+                    def_id,
+                    lang_items.mut_slice_ptr_impl(),
+                    None,
+                    "mut_slice_ptr",
+                    "*mut [T]",
+                    item.span,
+                );
+            }
             ty::RawPtr(ty::TypeAndMut { ty: _, mutbl: hir::Mutability::Not }) => {
                 self.check_primitive_impl(
                     def_id,