http://d.puremagic.com/issues/show_bug.cgi?id=3803

           Summary: compiler segfaults
           Product: D
           Version: 1.056
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: fawzi@gmx.ch


--- Comment #0 from Fawzi Mohamed <fawzi@gmx.ch> 2010-02-14 09:27:53 PST ---
The following (incorrect) code segfaults the compiler

I suppose that it is connected with something segfault on correct code of xf.omg.core.CoordSys and that it is connected with #3792

{{{
struct S {
    int x;

    template T(int val) {
        const P T = { val }; // the P here is an error it should be S
    }
}

template V(R,int val){
    const R V=R.T!(val);
}

const S x = V!(S,0);
}}}

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug@yahoo.com.au


--- Comment #1 from Don <clugdbug@yahoo.com.au> 2010-02-15 01:16:22 PST ---
This was a regression since 1.053. Suprisingly, it is fixed by bug 3767, in svn 367.

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--- Comment #2 from Fawzi Mohamed <fawzi@gmx.ch> 2010-02-27 15:49:51 PST ---
I have tried to find the problem using ldc (that shares the problem), also
using the larger correct code that shows the problem (stacktraces are similar).

The problem seems to be located in expression.c:5048

        Dsymbol *s = ti->inst->toAlias();

ti->inst == NULL, so that the compiler segfaults.
In the correct code I am not sure if inst is NULL because a single pass cannot
instantiate the template, or because it is in an is expression.
In any case simply catching this case and return new ErrorExp(); doesn't seem
to be enough (then I have other problems).

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--- Comment #3 from Fawzi Mohamed <fawzi@gmx.ch> 2010-02-28 16:02:28 PST ---
a clean compile, and my fix doesn't look to bad.

klickverbot even tested dstess, and it did not make anything worse.

It might not be the correct fix, but still improves things.
{{{
diff -r 9cc791423e20 dmd/expression.c
--- a/dmd/expression.c    Thu Feb 25 17:12:54 2010 -0700
+++ b/dmd/expression.c    Sun Feb 28 23:59:36 2010 +0100
 -5946,6 +5946,7 @@
     eleft = dte->e1;
     ti->tempdecl = td;
     ti->semantic(sc);
+        if (ti->inst == NULL) return new ErrorExp();
     Dsymbol *s = ti->inst->toAlias();
     Declaration *v = s->isDeclaration();
     if (v)
}}}

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Kosmonaut <Kosmonaut@tempinbox.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Kosmonaut@tempinbox.com


--- Comment #4 from Kosmonaut <Kosmonaut@tempinbox.com> 2010-03-02 18:41:32 PST ---
SVN commit: http://www.dsource.org/projects/dmd/changeset/404

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Walter Bright <bugzilla@digitalmars.com> changed:

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


--- Comment #5 from Walter Bright <bugzilla@digitalmars.com> 2010-03-08 22:23:57 PST ---
Fixed dmd 1.057 and 2.041

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