http://d.puremagic.com/issues/show_bug.cgi?id=5878

           Summary: Forward reference in returning superclass from
                    template using is() expression (Breaks
                    std.traits.BaseTypeTuple)
           Product: D
           Version: D1 & D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: kennytm@gmail.com
            Blocks: 340


--- Comment #0 from kennytm@gmail.com 2011-04-24 00:47:15 PDT ---
Test case:

------------------------
template J(A) {
    static if (is(A P == super))
        alias P J;
}

alias J!(A) Z;

class X {}
class A : X {}
------------------------
y.d(6): Error: forward reference to '(in X)'
------------------------

The template J is basically std.traits.BaseTypeTuple. Because of this bug, any use of BaseTypeTuple!A before A is defined (not just X) will result in a forward-reference bug.

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull


--- Comment #1 from Kenji Hara <k.hara.pg@gmail.com> 2013-04-07 05:22:55 PDT ---
D2 pull: https://github.com/D-Programming-Language/dmd/pull/1859

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--- Comment #2 from github-bugzilla@puremagic.com 2013-04-08 16:37:54 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/ae640c4414237fcb3edc14a664aa484a1a284257
fix Issue 5878 - Forward reference in returning superclass from template using
is() expression

https://github.com/D-Programming-Language/dmd/commit/94e608ad923eb33c0c7f8f05cea57fc50e73d169 Merge pull request #1859 from 9rnsr/fix5878

Issue 5878 - Forward reference in returning superclass from template using is()
expression

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