[Issue 10326] Disallow 'invariant' for immutable, allow class/struct invariants without (), and later disallow usage of ()

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=10326

--- Comment #10 from Temtaime <temtaime at gmail.com> ---
@Kenji it's useless imo.

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