4 fail_compilation/fail217.d(22): Error: mutable method `fail217.Message.this` is not callable using a `immutable` object
5 fail_compilation/fail217.d(13): Consider adding `const` or `inout` here
13 this( int notifier_object
)
15 notifier
= notifier_object
;
22 auto m2
= new immutable(Message
)(2);