Add missing type-checking for slice types

Author: philberty

gcc/rust/hir/tree/rust-hir-type.h

@@ -668,6 +668,8 @@ class SliceType : public TypeNoBounds
   void accept_vis (HIRFullVisitor &vis) override;
   void accept_vis (HIRTypeVisitor &vis) override;
 
+  std::unique_ptr<Type> &get_element_type () { return elem_type; }
+
 protected:
   /* Use covariance to implement clone function as returning this object rather
    * than base */

gcc/rust/typecheck/rust-hir-type-check-type.cc

@@ -600,5 +600,15 @@ TypeCheckType::visit (HIR::ArrayType &type)
 				    TyTy::TyVar (base->get_ref ()));
 }
 
+void
+TypeCheckType::visit (HIR::SliceType &type)
+{
+  TyTy::BaseType *base
+    = TypeCheckType::Resolve (type.get_element_type ().get ());
+  translated
+    = new TyTy::SliceType (type.get_mappings ().get_hirid (), type.get_locus (),
+			   TyTy::TyVar (base->get_ref ()));
+}
+
 } // namespace Resolver
 } // namespace Rust

gcc/rust/typecheck/rust-hir-type-check-type.h

@@ -120,6 +120,8 @@ class TypeCheckType : public TypeCheckBase
 
   void visit (HIR::ArrayType &type) override;
 
+  void visit (HIR::SliceType &type) override;
+
   void visit (HIR::ReferenceType &type) override
   {
     TyTy::BaseType *base
@@ -338,8 +340,8 @@ class ResolveWhereClauseItem : public TypeCheckBase
     binding->inherit_bounds (specified_bounds);
 
     // When we apply these bounds we must lookup which type this binding
-    // resolves to, as this is the type which will be used during resolution of
-    // the block.
+    // resolves to, as this is the type which will be used during resolution
+    // of the block.
     NodeId ast_node_id = binding_type_path->get_mappings ().get_nodeid ();
 
     // then lookup the reference_node_id