std.container.Array deep-copy?

[qznc via Digitalmars-d-learn]

How can you deep-copy a std.container.Array instance?

The actual array data is heap-allocated and reference-counted.
Assignment and .dup only create additional references.

Using a copy constructor yields an error:

Array!Foo x;
Array!Foo y = Array!Foo(x);

Error: template std.container.Array!(Foo).Array.__ctor cannot
deduce function from argument types !()(Array!(Foo)), candidates
are:
/opt/compilers/dmd2/include/std/container.d(2652):
std.container.Array!(Foo).Array.__ctor(U)(U[] values...) if
(isImplicitlyConvertible!(U, T))
/opt/compilers/dmd2/include/std/container.d(2670):
std.container.Array!(Foo).Array.__ctor(Stuff)(Stuff stuff) if
(isInputRange!Stuff &&
isImplicitlyConvertible!(ElementType!Stuff, T) && !is(Stuff ==
T[]))


The question came up in a reddit discussion:
http://www.reddit.com/r/programming/comments/2ipdpa/floss_weekly_311_the_d_language/cl4yv8w