[Issue 11331] Inefficient initialization of struct with members = void

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11331



--- Comment #4 from Andrei Alexandrescu <andrei at erdani.com> 2013-10-23 10:07:14 PDT ---
http://dlang.org/struct.html mentions that "Struct instances that are not
instantiated with a constructor are default initialized to their .init value."
and mentions that S() is "same as auto b = S.init;"

There is no guarantee about the values of the = void members in S.init, but
definitely the spec clarifies that two default-constructed objects will compare
equal. So we need to change the spec to only guarantee non-=void fields of
default-constructed objects to be equal.

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