PR c++/92746 - ICE with noexcept of function concept check.

Another place that needs to specially handle Concepts TS function-style
concepts.

	* except.c (check_noexcept_r): Handle concept-check.

gcc/cp/ChangeLog

 2020-01-13  Jason Merrill  <jason@redhat.com>
 
+	PR c++/92746 - ICE with noexcept of function concept check.
+	* except.c (check_noexcept_r): Handle concept-check.
+
 	PR c++/92582 - ICE with member template as requirement.
 	* pt.c (struct find_template_parameter_info): Add ctx_parms.
 	(any_template_parm_r): Handle TEMPLATE_DECL.

gcc/cp/except.c

@@ -1117,6 +1117,8 @@ check_noexcept_r (tree *tp, int * /*walk_subtrees*/, void * /*data*/)
 
          We could use TREE_NOTHROW (t) for !TREE_PUBLIC fns, though... */
       tree fn = cp_get_callee (t);
+      if (concept_check_p (fn))
+	return NULL_TREE;
       tree type = TREE_TYPE (fn);
       gcc_assert (INDIRECT_TYPE_P (type));
       type = TREE_TYPE (type);

gcc/testsuite/g++.dg/concepts/fn-concept3.C

+// PR c++/92746
+// { dg-do compile { target c++17_only } }
+// { dg-options "-fconcepts" }
+
+template<typename T> concept bool C3() { return true; }
+static_assert(noexcept(C3<int>()), "function concept should be treated as if noexcept(true) specified");