gccrs: ast: Add new Kind enums for more precise downcasting

This commit adds things like Item::Kind, Expr::Kind, etc, and implements the associated `get_*_kind` functions.
It also removes the more generic AST::Kind enum we were using, which was incomplete and painful to use.

gcc/rust/ChangeLog:

	* ast/rust-ast.h: Add new Kind enums, remove Node class.
	* ast/rust-builtin-ast-nodes.h: Use new Kind enums.
	* ast/rust-expr.h (class LoopLabel): Likewise.
	* ast/rust-item.h: Likewise.
	* ast/rust-macro.h: Likewise.
	* ast/rust-path.h: Likewise.
	* expand/rust-macro-builtins-helpers.cc: Likewise.
	* expand/rust-macro-builtins-utility.cc (MacroBuiltin::concat_handler): Likewise.
	(MacroBuiltin::stringify_handler): Likewise.
	* resolve/rust-ast-resolve-expr.cc (ResolveExpr::visit): Likewise.
	* resolve/rust-early-name-resolver.cc: Likewise.
	* hir/rust-ast-lower.cc (ASTLoweringBlock::visit): Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/rust/expand/rust-macro-builtins-helpers.cc b/gcc/rust/expand/rust-macro-builtins-helpers.cc
index 55d113c..864379a 100644
--- a/gcc/rust/expand/rust-macro-builtins-helpers.cc
+++ b/gcc/rust/expand/rust-macro-builtins-helpers.cc
@@ -36,7 +36,7 @@ check_for_eager_invocations (
   std::vector<std::unique_ptr<AST::MacroInvocation>> pending;
 
   for (auto &expr : expressions)
-    if (expr->get_ast_kind () == AST::Kind::MACRO_INVOCATION)
+    if (expr->get_expr_kind () == AST::Expr::Kind::MacroInvocation)
       pending.emplace_back (std::unique_ptr<AST::MacroInvocation> (
 	static_cast<AST::MacroInvocation *> (expr->clone_expr ().release ())));