gccrs: Make globbing definition shadowable by default

Elements from glob use declaration shall be shadowable by default.

gcc/rust/ChangeLog:

	* resolve/rust-forever-stack.h: Add a new function prototype to insert
	a shadowable definition.
	* resolve/rust-forever-stack.hxx: Add the new insert_shadowable
	function to insert shadowable definition into the forever stack.
	* resolve/rust-name-resolution-context.cc (NameResolutionContext::insert_shadowable):
	Likewise with the name resolution context.
	* resolve/rust-name-resolution-context.h: Add name resolution context
	insert_shadowable member function prototype.
	* resolve/rust-toplevel-name-resolver-2.0.cc (GlobbingVisitor::visit):
	Insert shadowable definition into the forever stack for glob use
	declaration.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/rust/resolve/rust-forever-stack.h b/gcc/rust/resolve/rust-forever-stack.h
index 01371fc..bba5875 100644
--- a/gcc/rust/resolve/rust-forever-stack.h
+++ b/gcc/rust/resolve/rust-forever-stack.h
@@ -438,6 +438,21 @@ public:
   tl::expected<NodeId, DuplicateNameError> insert (Identifier name, NodeId id);
 
   /**
+   * Insert a new shadowable definition in the innermost `Rib` in this stack
+   *
+   * @param name The name of the definition
+   * @param id Its NodeId
+   *
+   * @return `DuplicateNameError` if that node was already present in the Rib,
+   * the node's `NodeId` otherwise.
+   *
+   * @aborts if there are no `Rib`s inserted in the current map, this function
+   *         aborts the program.
+   */
+  tl::expected<NodeId, DuplicateNameError> insert_shadowable (Identifier name,
+							      NodeId id);
+
+  /**
    * Insert a new definition at the root of this stack
    *
    * @param name The name of the definition