C++ PATCH for c++/9798

[Jason Merrill]

We got into an infinite recursion between two namespaces which use each
other, because we were recursing into the used namespaces before adding
ourselves to the list of currently used namespace.

Tested i686-pc-linux-gnu, applied to trunk and 3.3.  Patch in
g++.dg/lookup/using3.C.

2003-03-10  Jason Merrill  <jason@redhat.com>

	PR c++/9798
	* decl.c (push_using_directive): Push before recursing.

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