[Issue 6838] New: Covariant return types don't work with static arrays

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6838

           Summary: Covariant return types don't work with static arrays
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: pszturmaj at tlen.pl


--- Comment #0 from Piotr Szturmaj <pszturmaj at tlen.pl> 2011-10-22 09:07:48 PDT ---
This is an example from http://d-programming-language.org/function.html, but
with changed return types:

class Foo {
  int[] test() { return null; }
}

class Bar : Foo {
  int[2] test() { return [1, 2]; } // overrides and is covariant with
Foo.test()
}

// and here's additional test code:

void main() {
  Foo f = new Bar();
  auto arr = f.test();
  assert(arr.length == 2);
}

This code compiles but fails on assert. Returned arr.length is 1 and accessing
the first element of that array results in access violation.

Given that static arrays are implicitly convertible to dynamic arrays, it
should work. If not, it at least should not compile.

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