[Issue 19754] cast() sometimes yields lvalue, sometimes yields rvalue

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19754

--- Comment #8 from Andrei Alexandrescu <andrei at erdani.com> ---
It seems the main anomaly is that cast() yields (sometimes...) an lvalue for
shared data. Razvan, can you investigate if code would break if we forced
cast() on shared data to always return an rvalue?

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