[committed] Add testcase for already fixed PR c++/87897

[Jakub Jelinek]

On Wed, Dec 05, 2018 at 04:34:14AM -0200, Alexandre Oliva wrote:
> for  gcc/cp/ChangeLog
> 
>       PR c++/85569
>       * constexpr.c (adjust_temp_type): Test for type equality with
>       same_type_p.
>       (constexpr_call_hasher::equal): Likewise.
> 
> for  gcc/testsuite
> 
>       PR c++/85569
>       * g++.dg/cpp1z/pr85569.C: New.

This patch fixed also PR87897, I've added the following testcase from it,
regtested on x86_64-linux and committed as obvious:

2018-12-05  Jakub Jelinek  <ja...@redhat.com>

        PR c++/87897
        * g++.dg/init/const13.C: New test.

--- gcc/testsuite/g++.dg/init/const13.C.jj      2018-12-05 09:39:04.604974302 
+0100
+++ gcc/testsuite/g++.dg/init/const13.C 2018-12-05 09:38:55.961117120 +0100
@@ -0,0 +1,5 @@
+// PR c++/87897
+// { dg-do compile }
+
+typedef struct A {} B;
+A const a = B ();


        Jakub