[Issue 24654] Parameters in contracts should be `const`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24654

Nick Treleaven <nick at geany.org> changed:

           What    |Removed                     |Added
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                 CC|                            |nick at geany.org

--- Comment #1 from Nick Treleaven <nick at geany.org> ---
The problem with requiring const for out parameters is that the return type
might not convert to const if it has mutable indirections.

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