http://d.puremagic.com/issues/show_bug.cgi?id=4503

           Summary: forward reference to aliased template instance
           Product: D
           Version: D1 & D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: mrmocool@gmx.de


--- Comment #0 from Trass3r <mrmocool@gmx.de> 2010-07-24 11:41:59 PDT ---
This is an extremely simplified version of my real code (cl4d) where these 3
parts are distributed among several files (and thus heavily depend on the build
order).

----

class Collection(T)
{
}
ICollection c;

alias Collection!int ICollection;

fwdref2.d(4): Error: forward reference to 'Collection!(int)'
fwdref2.d(4): Error: ICollection is used as a type

----

Putting ICollection c; at the end makes it compile.

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--- Comment #1 from Trass3r <mrmocool@gmx.de> 2010-07-24 12:05:53 PDT ---
error occurs at mtype.c:5542
if (t->ty == Tinstance && t != this && !t->deco)
{   error(loc, "forward reference to '%s'", t->toChars());
    return;
}

This is also true if ICollection is referenced like this:
void foo(ICollection c)
{
}

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Trass3r <mrmocool@gmx.de> changed:

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


--- Comment #2 from Trass3r <mrmocool@gmx.de> 2010-07-25 14:04:50 PDT ---
A test with

if (t->ty == Tinstance && t != this && !t->deco)
{   //error(loc, "forward reference to '%s'", t->toChars());
    //return;
    t = t->semantic(loc, sc);
}

solved this issue. Don't know if that causes other problems though.

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Rainer Schuetze <r.sagitario@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |r.sagitario@gmx.de


--- Comment #3 from Rainer Schuetze <r.sagitario@gmx.de> 2010-07-26 00:32:51 PDT ---
This patch seems a bit more generic and solved a similar issue for me. It also works for your code:

Index: declaration.c ===================================================================
--- declaration.c    (revision 576)
+++ declaration.c    (working copy)
@@ -594,6 +594,9 @@
     {   error("recursive alias declaration");
         aliassym = new TypedefDeclaration(loc, ident, Type::terror, NULL);
     }
+    else if (!aliassym && scope)
+        semantic(scope);
+
     Dsymbol *s = aliassym ? aliassym->toAlias() : this;
     return s;
 }

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--- Comment #4 from Trass3r <mrmocool@gmx.de> 2010-07-26 06:05:39 PDT ---
Great!
Also seems to solve http://d.puremagic.com/issues/show_bug.cgi?id=4267

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Trass3r <mrmocool@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |4267


--- Comment #5 from Trass3r <mrmocool@gmx.de> 2010-07-27 10:18:02 PDT ---
And this one: http://d.puremagic.com/issues/show_bug.cgi?id=3679

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #6 from Walter Bright <bugzilla@digitalmars.com> 2010-08-08 21:32:00 PDT ---
http://www.dsource.org/projects/dmd/changeset/607

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |clugdbug@yahoo.com.au
         Resolution|                            |FIXED


--- Comment #7 from Don <clugdbug@yahoo.com.au> 2010-08-29 12:39:56 PDT ---
Fixed DMD1.063 and 2.048.

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