[Issue 15862] dmd thinks functions are strongly pure despite mutable indirections in the return type

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15862

--- Comment #4 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Proper test case:

int[] a=f();
int[] b=f();
a[0]=0;
b[0]=1;
assert(a[0]==0 && b[0]==1);

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