[Bug c++/59759] internal compiler error: in unify, using std::enable_if on classes

[ktietz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59759

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ktietz at gcc dot gnu.org

--- Comment #11 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Hmm, I think this might be not the thing wanted here.  But infact having a
VAR_DECL can be caused by prior errors introducing them.  So we might simple
want to treat VAR_DECL in unify via unify_template_argument_mismatch.

ChangeLog

2014-12-22  Kai Tietz  <ktietz@redhat.com>

    PR c++/59759
    * pt.c (unify): Don't ICE on VAR_DECL.


Regression tested on x86_64-w64-mingw32.  Ok for apply?

Regards,
Kai

Index: pt.c
===================================================================
--- pt.c        (Revision 219014)
+++ pt.c        (Arbeitskopie)
@@ -18490,11 +18490,12 @@ unify (tree tparms, tree targs, tree parm, tree ar

     case VAR_DECL:
       /* A non-type template parameter that is a variable should be a
-        an integral constant, in which case, it whould have been
+        an integral constant, in which case, it should have been
         folded into its (constant) value. So we should not be getting
-        a variable here.  */
-      gcc_unreachable ();
+        a variable here out-side of an error-case.  */

+      return unify_template_argument_mismatch (explain_p, parm, arg);
+
     case TYPE_ARGUMENT_PACK:
     case NONTYPE_ARGUMENT_PACK:
       return unify (tparms, targs, ARGUMENT_PACK_ARGS (parm),