re PR c++/67595 (concepts code causes segfault)

2017-10-30  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/67595
	* g++.dg/concepts/pr67595.C: New.

From-SVN: r254245

gcc/testsuite/ChangeLog

+2017-10-30  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/67595
+	* g++.dg/concepts/pr67595.C: New.
+
 2017-10-30  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/80850

gcc/testsuite/g++.dg/concepts/pr67595.C

+// { dg-options "-std=c++17 -fconcepts" }
+
+template <class X> concept bool allocatable = requires{{new X}->X * };
+template <class X> concept bool semiregular = allocatable<X>;
+template <class X> concept bool readable = requires{requires semiregular<X>};
+template <class> int weak_input_iterator = requires{{0}->readable};
+template <class X> bool input_iterator{weak_input_iterator<X>};
+template <class X> bool forward_iterator{input_iterator<X>};
+template <class X> bool bidirectional_iterator{forward_iterator<X>};
+template <class X>
+concept bool random_access_iterator{bidirectional_iterator<X>};
+void fn1(random_access_iterator);
+int main() { fn1(0); }  // { dg-error "" }