re PR c++/9420 (incomplete type incorrectly reported)

        PR c++/9420
        * search.c (lookup_conversions): Call complete_type here.
        * call.c (implicit_conversion): Not here.

From-SVN: r64649

gcc/testsuite/g++.dg/template/overload1.C

+// PR c++/9420
+// Bug: We were instantiating B<int> during overload resolution for E<0.
+// This is wrong; the contents of B<int> are not relevant, since we can't
+// use its constructors (because we'd already be using a constructor for
+// C).
+
+enum { E };
+
+template <typename T> struct A {
+  static const int a = (E < 0);
+};
+
+template <typename T> class B {
+  A<int> b;
+};
+
+struct C {
+  C(B<int>);
+};
+
+int operator<(C, C);
+
+A<int> c;