Consider:
auto foo(T)(T a) {
T b; // Error: cannot access frame pointer of main.X
b.data[] = 1;
return b;
}
void main() {
struct X {
this(int) {}
int[4096] data;
}
foo(X());
}
Note the error is because you cannot construct the main.X object
without a frame pointer.
You could do `T b = a` here to get a's frame pointer, but it
would also copy all of a's data, which is expensive and
unnecessary.
Is there a way to only copy a's frame pointer into b?
(Note: this is just an illustrative example, real problem here:
https://issues.dlang.org/show_bug.cgi?id=13935)
