cp:
	PR c++/18949
	* pt.c (tsubst_copy_and_build): <INDIRECT_REF case> Check that a
	REFERENCE_REF_P is dereferencing a reference type.
	* typeck.c (build_static_cast): Convert from reference even in a
	template.
	(build_reinterpret_cast, build_const_cast, build_c_cast): Likewise.
testsuite:
	PR c++/18949
	* g++.dg/template/cast1.C: New.

From-SVN: r92136