[PATCH] Fix test to compile in C++98 mode

[Jonathan Wakely]

While backporting a commit to gcc-5-branch I noticed this test doesn't
build in c++98 mode (the default on gcc-5-branch).

Fixed like so. Tested x86_64-linux, committed to gcc-6-branch.


commit db3afd0ee4833edd3ca967e40aef629a032575b8
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Thu May 18 10:07:47 2017 +0100

    Fix test to compile in C++98 mode
    
        * testsuite/libstdc++-prettyprinters/59161.cc: Fix for C++98 mode.

diff --git a/libstdc++-v3/testsuite/libstdc++-prettyprinters/59161.cc 
b/libstdc++-v3/testsuite/libstdc++-prettyprinters/59161.cc
index d8fef27..a2d7f96 100644
--- a/libstdc++-v3/testsuite/libstdc++-prettyprinters/59161.cc
+++ b/libstdc++-v3/testsuite/libstdc++-prettyprinters/59161.cc
@@ -59,8 +59,7 @@ int main()
   std::set<C>::iterator siter = s.begin();
 // { dg-final { regexp-test siter {ref = @0x.*} } }
 
-  std::vector<C> v;
-  v.push_back(c);
+  std::vector<C> v(1, c);
   std::vector<C>::iterator viter = v.begin();
 // { dg-final { regexp-test viter {ref = @0x.*} } }