[Issue 10021] New: auto return type and covariance

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10021

           Summary: auto return type and covariance
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: SebastianGraf at t-online.de


--- Comment #0 from Sebastian Graf <SebastianGraf at t-online.de> 2013-05-03 14:09:07 PDT ---
This snippet:

interface I { I makeI(); }
class D : I { D makeI() { return this; } }
class C : I { auto makeI() { return this; } }

does not compile. It fails in the third line with

Error: function C.makeI of type () overrides but is not covariant with I.makeI
of type I()

I think this should compile, especially because class D with explicit return
type compiles fine. It seems to me that covariance with the interface is
checked for before the return type is inferred.

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