[Issue 5038] Change class 'invariant' syntax to emulate 'unittest'

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5038



--- Comment #3 from bearophile_hugs at eml.cc 2013-01-16 10:01:17 PST ---
(In reply to comment #2)
> The parentheses are necessary, because without them invariant is a deprecated
> alias for immutable.

Eventually that alternative meaning will go away, so invariant for
structs/class instances will be free to drop the useless ().

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