[Issue 7456] Purity strength not documented

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=7456


yebblies <yebblies at gmail.com> changed:

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                 CC|                            |yebblies at gmail.com


--- Comment #4 from yebblies <yebblies at gmail.com> 2014-01-15 19:55:43 EST ---
(In reply to comment #3)
> 
> At the present time, the implicit cast is only permitted when all parameters
> are immutable or are value types. But at some point in the future we could
> decide to extend it to any case where it's impossible to have aliasing between
> parameters and return values.

Actually Kenji added some of this a while back, but some of the aliasing checks
are wrong/missing.

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