re PR c++/83924 (ICE: Error reporting routines re-entered with -Wduplicated-branches)

2018-01-27  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/83924
	* g++.dg/warn/Wduplicated-branches5.C: New.

From-SVN: r257131

gcc/testsuite/ChangeLog

+2018-01-27  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/83924
+	* g++.dg/warn/Wduplicated-branches5.C: New.
+
 2018-01-26  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* gcc.target/powerpc/safe-indirect-jump-1.c: Build on all targets.

gcc/testsuite/g++.dg/warn/Wduplicated-branches5.C

+// PR c++/83924
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wduplicated-branches" }
+
+class GenVectorS {};
+
+template<int N>
+using  VectorS = GenVectorS;
+
+template<int n, int m>
+void runB(const VectorS<(n > m ? n : m)>)
+{}
+
+void runA() {
+	runB<1, 1>(VectorS<1>{});
+}