re PR c++/12253 ([tree-ssa] ICE on conversion to std::string inside array initialization)

        PR c++/12253
        * init.c (build_vec_init): Initialization of an element from
        an initializer list is also a full-expression.

From-SVN: r74798

gcc/testsuite/g++.dg/init/array12.C

+// PR c++/12253
+// Bug: We were failing to destroy the temporary A passed to the
+// constructor for b[0] before going on to construct b[1].
+
+// { dg-do run }
+
+extern "C" int printf (const char *, ...);
+
+int c;
+int r;
+
+struct A
+{
+  A() { printf ("A()\n"); if (c++) r = 1; }
+  A(const A&) { printf ("A(const A&)\n"); ++c; }
+  ~A() { printf ("~A()\n"); --c; }
+};
+ 
+struct B
+{
+  B(int, const A& = A()) { printf ("B()\n"); }
+};
+ 
+int main()
+{
+  B b[] = { 0, 0 };
+  return r;
+}