http://d.puremagic.com/issues/show_bug.cgi?id=5899

           Summary: auto-return function cannot match 'null' with
                    reference type.
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: kennytm@gmail.com


--- Comment #0 from kennytm@gmail.com 2011-04-27 08:46:39 PDT ---
Test code 1:
---------------------------
class K {}
auto f(bool b) {
    if (b)
        return new K;
    else
        return null;
}
---------------------------
x.d(6): Error: mismatched function return type inference of void* and x.K
---------------------------



Test code 2:
---------------------------
auto f(bool b) {
    if (b)
        return new int;
    else
        return null;
}
---------------------------
x.d(5): Error: mismatched function return type inference of void* and int*
---------------------------



DMD should know that 'null' is a valid value for any reference types.

A workaround is to give an exact type, e.g.
---------------------------
auto f(bool b) {
    if (b)
        return new int; // or new K;
    else {
        typeof(return) n = null;
        return n;
    }
}
---------------------------
but this should not be necessary.


(Perhaps the D spec should give a specific type e.g. 'nullptr_t' for 'null'?)

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #1 from Kenji Hara <k.hara.pg@gmail.com> 2011-10-27 05:08:39 PDT ---
https://github.com/D-Programming-Language/dmd/pull/476

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |FIXED


--- Comment #2 from Walter Bright <bugzilla@digitalmars.com> 2011-11-25 00:29:00 PST ---
https://github.com/D-Programming-Language/dmd/commit/31a3e406938cef17c8c6354ac5de70ad07707027

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