re PR c++/89914 (ICE in nothrow_spec_p, at cp/except.c:1238)

re PR c++/89914 (ICE in nothrow_spec_p, at cp/except.c:1238)

/cp
2019-04-08  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/89914
	* semantics.c (trait_expr_value): Don't use TYPE_NOTHROW_P
	when maybe_instantiate_noexcept fails.
	(classtype_has_nothrow_assign_or_copy_p): Likewise.
	* method.c (implicitly_declare_fn): Avoid passing error_mark_node
	to build_exception_variant.

/testsuite
2019-04-08  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/89914
	* g++.dg/ext/has_nothrow_constructor-3.C: New.

From-SVN: r270201