gccrs: ast: Add take_items() and set_items() methods for Item containers

Both the AST::Crate and AST::Module class are std::unique_ptr<AST::Item>
containers, and may require spurious insertions in these containers,
for example when expanding a procedural macro, or in our case, escaping
macros through the #[macro_use] attribute. These functions allow you
to replace *all* of the items contained in such a container.

gcc/rust/ChangeLog:

	* ast/rust-ast.h: Add take_items() and set_items() method to Crate.
	* ast/rust-item.h: Add take_items() and set_items() method to Module.

2 files changed, 20 insertions, 0 deletions

diff --git a/gcc/rust/ast/rust-ast.h b/gcc/rust/ast/rust-ast.h
index 8dfdba0..2077a81 100644
--- a/gcc/rust/ast/rust-ast.h
+++ b/gcc/rust/ast/rust-ast.h
@@ -1931,6 +1931,16 @@ public:
 
   NodeId get_node_id () const { return node_id; }
   const std::vector<Attribute> &get_inner_attrs () const { return inner_attrs; }
+
+  std::vector<std::unique_ptr<AST::Item>> take_items ()
+  {
+    return std::move (items);
+  }
+
+  void set_items (std::vector<std::unique_ptr<AST::Item>> &&new_items)
+  {
+    items = std::move (new_items);
+  }
 };
 
 // Base path expression AST node - abstract
diff --git a/gcc/rust/ast/rust-item.h b/gcc/rust/ast/rust-item.h
index dec8ab7..a905914 100644
--- a/gcc/rust/ast/rust-item.h
+++ b/gcc/rust/ast/rust-item.h
@@ -1114,6 +1114,16 @@ public:
   const std::vector<std::unique_ptr<Item>> &get_items () const { return items; }
   std::vector<std::unique_ptr<Item>> &get_items () { return items; }
 
+  std::vector<std::unique_ptr<AST::Item>> take_items ()
+  {
+    return std::move (items);
+  }
+
+  void set_items (std::vector<std::unique_ptr<AST::Item>> &&new_items)
+  {
+    items = std::move (new_items);
+  }
+
   // move constructors
   Module (Module &&other) = default;
   Module &operator= (Module &&other) = default;