[Issue 23497] Erroneous escape reference to parameter error.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23497

--- Comment #2 from deadalnix <deadalnix at gmail.com> ---
No, it's nonsense, and no reference to _error is going to escape. _error is a
pointer, and it is returned by value. What escapes is a reference to the class
instance _error points toward.

Also, the in contract is somehow needed for the error to trigger, so
something's not right either way.

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