fn appendErrorNode( astgen: *AstGen, node: Ast.Node.Index, comptime format: []const u8, args: anytype, ) Allocator.Error!void
fn appendErrorNode( astgen: *AstGen, node: Ast.Node.Index, comptime format: []const u8, args: anytype, ) Allocator.Error!void { try astgen.appendErrorNodeNotes(node, format, args, &[0]u32{}); }