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digitalmars.D.bugs - [Issue 7072] New: [2.057 Beta] Assertion failure: '0' on line 145 in file 'mtype.c'

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           Summary: [2.057 Beta]  Assertion failure:  '0' on line 145 in
                    file 'mtype.c'
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: ice-on-valid-code
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: dsimcha yahoo.com


--- Comment #0 from David Simcha <dsimcha yahoo.com> 2011-12-06 06:26:07 PST ---
I get this error message when trying to build SciD with 2.057 beta.  

Assertion failure: '0' on line 145 in file 'mtype.c'

This doesn't happen with 2.056.  I haven't had a chance to reduce this yet, but
I will try tonight if the assertion failure isn't enough of a hint.  (I don't
imagine reducing this one will be easy.)

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--- Comment #1 from David Simcha <dsimcha yahoo.com> 2011-12-06 15:56:46 PST ---
I didn't realize the significance of this until I looked at the source code to
mtype.c, but there's actually a line before the assertion failure line.  The
full error message is:

ty = 41
Assertion failure: '0' on line 145 in file 'mtype.c'

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--- Comment #2 from David Simcha <dsimcha yahoo.com> 2011-12-06 17:33:24 PST ---
Unbelievably simple test case after about 1.5 hours of recursively reducing
SciD code:

struct S
{
    this(A)(A args) { }
}

void main() {
   auto s = S( null );
}

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Walter Bright <bugzilla digitalmars.com> changed:

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


--- Comment #3 from Walter Bright <bugzilla digitalmars.com> 2011-12-06
20:54:20 PST ---
Thanks for your hard work, David. I found the problem, and am testing the fix.

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--- Comment #4 from Walter Bright <bugzilla digitalmars.com> 2011-12-06
21:09:06 PST ---
https://github.com/D-Programming-Language/dmd/commit/0a20f8f170cbcbf3f3fd6971b339e8d82d311a1c

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Robert Clipsham <robert octarineparrot.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |robert octarineparrot.com


--- Comment #5 from Robert Clipsham <robert octarineparrot.com> 2011-12-07
20:07:03 GMT ---
(In reply to comment #2)

 Unbelievably simple test case after about 1.5 hours of recursively reducing
 SciD code:


Have you come cross this tool? It helps tremendously with reducing test cases:
https://github.com/cybershadow/dustmite

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--- Comment #6 from David Simcha <dsimcha yahoo.com> 2011-12-07 13:19:49 PST ---
I'm aware of DustMite.  I just never got around to setting it up/learning how
it works because it doesn't look easy.  Usually reducing stuff like this
doesn't take very long.  It's just that this one had to (unexpectedly) follow a
whole chain of template instantiations.

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