--- a/gcc/testsuite/g++.dg/cpp1z/decomp4.C	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/testsuite/g++.dg/cpp1z/decomp4.C	Thu Feb 13 11:34:05 2020 +0900
@@ -15,18 +15,18 @@
 test (A &a, B &b, C &c, D &d, E &e, F &f, G &g, H &h, I &i)
 {
   auto [ j ] = a;			// { dg-error "cannot decompose class type 'A' because it has an anonymous struct member" }
-					// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } .-1 }
+					// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } .-1 }
   auto [ k ] { b };			// { dg-error "cannot decompose class type 'B' because it has an anonymous union member" }
-					// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } .-1 }
+					// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } .-1 }
   auto [ l, l2 ] = c;			// { dg-error "cannot decompose inaccessible member 'C::b' of 'C'" }
-					// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } .-1 }
-  auto [ m ] = d;			// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } }
+					// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } .-1 }
+  auto [ m ] = d;			// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } }
   auto [ n ] { e };			// { dg-error "cannot decompose inaccessible member 'E::a' of 'E'" }
-					// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } .-1 }
-  auto [ o ] { f };			// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } }
+					// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } .-1 }
+  auto [ o ] { f };			// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } }
   auto & [ p ] { g };			// { dg-error "cannot decompose class type 'G': both it and its base class 'F' have non-static data members" }
-					// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } .-1 }
-  auto [ q ] { h };			// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } }
+					// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } .-1 }
+  auto [ q ] { h };			// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } }
   auto [ r ] { i };			// { dg-error "cannot decompose class type 'I': its base classes 'F' and 'H' have non-static data members" }
-					// { dg-warning "structured bindings only available with -std=c..17 or -std=gnu..17" "" { target c++14_down } .-1 }
+					// { dg-warning "structured bindings only available with '-std=c..17' or '-std=gnu..17'" "" { target c++14_down } .-1 }
 }