re PR c++/6255 (ICE with templatess)

        PR c++/6255
        * decl.c (lookup_name_real): Build a new TYPENAME_TYPE rather than
        modifying the old one.

From-SVN: r60259

diff --git a/gcc/testsuite/g++.dg/ext/typename1.C b/gcc/testsuite/g++.dg/ext/typename1.C
new file mode 100644 (file)
index 0000000..1c6b838
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/typename1.C
@@ -0,0 +1,7 @@
+// PR c++/6255
+// { dg-options "-fpermissive -w" }
+
+template <class T> struct A { typedef int X; };
+template <class T> struct B { typedef A<T> Y; void f (Y::X); };
+template <class T, class T1, class T2, class T3> struct C : public B<T> { void g (Y::X); };
+template class B<int>;