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

[d-bugmail at puremagic.com]

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

--- Comment #16 from dlangBugzillaToGithub <robert.schadek at posteo.de> ---
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https://github.com/dlang/dmd/issues/18607

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