C++ PATCH to dump_expr for c++/4934

[Jason Merrill]

We were crashing under mangle_class_name_for_template with a parm of +int()
because dump_expr didn't know what to do with a CONVERT_EXPR with no type.
The obvious fix is as follows.

Test in g++.dg/template/nontype1.C.  Applied trunk, 3.0, 3.1.

2002-04-06  Jason Merrill  <jason@redhat.com>

	PR c++/4934
	* error.c (dump_expr) [CONVERT_EXPR]: Make sure TREE_TYPE (t) is
	set before checking it.

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