ast-builder: Add new methods around type paths.

gcc/rust/ChangeLog:

	* ast/rust-ast-builder.cc: New functions.
	* ast/rust-ast-builder.h: Declare them.

2 files changed, 67 insertions, 3 deletions

diff --git a/gcc/rust/ast/rust-ast-builder.cc b/gcc/rust/ast/rust-ast-builder.cc
index deef429..728d5c0 100644
--- a/gcc/rust/ast/rust-ast-builder.cc
+++ b/gcc/rust/ast/rust-ast-builder.cc
@@ -23,6 +23,7 @@
 #include "rust-expr.h"
 #include "rust-path.h"
 #include "rust-item.h"
+#include "rust-path.h"
 #include "rust-token.h"
 
 namespace Rust {
@@ -101,12 +102,27 @@ Builder::type_path_segment (std::string seg) const
 }
 
 std::unique_ptr<TypePathSegment>
-Builder::generic_type_path_segment (std::string seg, GenericArgs args) const
+Builder::type_path_segment (LangItem::Kind lang_item) const
+{
+  return std::unique_ptr<TypePathSegment> (
+    new TypePathSegment (lang_item, loc));
+}
+
+std::unique_ptr<TypePathSegment>
+Builder::type_path_segment_generic (std::string seg, GenericArgs args) const
 {
   return std::unique_ptr<TypePathSegment> (
     new TypePathSegmentGeneric (PathIdentSegment (seg, loc), false, args, loc));
 }
 
+std::unique_ptr<TypePathSegment>
+Builder::type_path_segment_generic (LangItem::Kind lang_item,
+				    GenericArgs args) const
+{
+  return std::unique_ptr<TypePathSegment> (
+    new TypePathSegmentGeneric (lang_item, args, loc));
+}
+
 std::unique_ptr<Type>
 Builder::single_type_path (std::string type) const
 {
@@ -117,14 +133,51 @@ Builder::single_type_path (std::string type) const
 }
 
 std::unique_ptr<Type>
+Builder::single_type_path (LangItem::Kind lang_item) const
+{
+  return std::unique_ptr<Type> (new TypePath (lang_item, {}, loc));
+}
+
+std::unique_ptr<Type>
 Builder::single_generic_type_path (std::string type, GenericArgs args) const
 {
   auto segments = std::vector<std::unique_ptr<TypePathSegment>> ();
-  segments.emplace_back (generic_type_path_segment (type, args));
+  segments.emplace_back (type_path_segment_generic (type, args));
 
   return std::unique_ptr<Type> (new TypePath (std::move (segments), loc));
 }
 
+std::unique_ptr<Type>
+Builder::single_generic_type_path (LangItem::Kind lang_item,
+				   GenericArgs args) const
+{
+  auto segments = std::vector<std::unique_ptr<TypePathSegment>> ();
+  segments.emplace_back (type_path_segment_generic (lang_item, args));
+
+  return std::unique_ptr<Type> (new TypePath (std::move (segments), loc));
+}
+
+TypePath
+Builder::type_path (std::unique_ptr<TypePathSegment> &&segment) const
+{
+  auto segments = std::vector<std::unique_ptr<TypePathSegment>> ();
+  segments.emplace_back (std::move (segment));
+
+  return TypePath (std::move (segments), loc);
+}
+
+TypePath
+Builder::type_path (std::string type) const
+{
+  return type_path (type_path_segment (type));
+}
+
+TypePath
+Builder::type_path (LangItem::Kind lang_item) const
+{
+  return type_path (type_path_segment (lang_item));
+}
+
 PathInExpression
 Builder::path_in_expression (std::vector<std::string> &&segments) const
 {
diff --git a/gcc/rust/ast/rust-ast-builder.h b/gcc/rust/ast/rust-ast-builder.h
index bb00377..86279b0 100644
--- a/gcc/rust/ast/rust-ast-builder.h
+++ b/gcc/rust/ast/rust-ast-builder.h
@@ -114,16 +114,27 @@ public:
 
   /* And similarly for type path segments */
   std::unique_ptr<TypePathSegment> type_path_segment (std::string seg) const;
+  std::unique_ptr<TypePathSegment>
+  type_path_segment (LangItem::Kind lang_item) const;
 
   std::unique_ptr<TypePathSegment>
-  generic_type_path_segment (std::string seg, GenericArgs args) const;
+  type_path_segment_generic (std::string seg, GenericArgs args) const;
+  std::unique_ptr<TypePathSegment>
+  type_path_segment_generic (LangItem::Kind lang_item, GenericArgs args) const;
 
   /* Create a Type from a single string - the most basic kind of type in our AST
    */
   std::unique_ptr<Type> single_type_path (std::string type) const;
+  std::unique_ptr<Type> single_type_path (LangItem::Kind lang_item) const;
 
   std::unique_ptr<Type> single_generic_type_path (std::string type,
 						  GenericArgs args) const;
+  std::unique_ptr<Type> single_generic_type_path (LangItem::Kind lang_item,
+						  GenericArgs args) const;
+
+  TypePath type_path (std::unique_ptr<TypePathSegment> &&segment) const;
+  TypePath type_path (std::string type) const;
+  TypePath type_path (LangItem::Kind lang_item) const;
 
   /**
    * Create a path in expression from multiple segments (`Clone::clone`). You