format

    pub fn format(self: *const @This(), w: *std.Io.Writer) std.Io.Writer.Error!void {
        var errors = self.iterateErrors();
        while (errors.next()) |err| {
            const loc = err.getLocation(self);
            const msg = err.fmtMessage(self);
            try w.print("{d}:{d}: error: {f}\n", .{ loc.line + 1, loc.column + 1, msg });

            var notes = err.iterateNotes(self);
            while (notes.next()) |note| {
                const note_loc = note.getLocation(self);
                const note_msg = note.fmtMessage(self);
                try w.print("{d}:{d}: note: {f}\n", .{
                    note_loc.line + 1,
                    note_loc.column + 1,
                    note_msg,
                });
            }
        }
    }