Silenced warnings about unused variables.

test/explicit_operator_bool_compile_fail_conv_int.cpp

@@ -35,6 +35,7 @@ int main(int, char*[])
 {
     checkable val;
     int n = val;
+    (void)n;
 
     return 0;
 }

test/explicit_operator_bool_compile_fail_conv_pvoid.cpp

@@ -35,6 +35,7 @@ int main(int, char*[])
 {
     checkable val;
     void* p = val;
+    (void)p;
 
     return 0;
 }

test/ref_rv_fail1.cpp

@@ -15,6 +15,7 @@
 int main()
 {
     boost::reference_wrapper<int const> r( 1 ); // this should produce an ERROR
+    (void)r;
 }
 
 #else

test/ref_rv_fail2.cpp

@@ -13,4 +13,5 @@
 int main()
 {
     boost::reference_wrapper<int> r = boost::ref( 2 ); // this should produce an ERROR
+    (void)r;
 }

test/ref_rv_fail3.cpp

@@ -19,6 +19,7 @@ X const crv() { return X(); }
 int main()
 {
     boost::reference_wrapper<X const> r = boost::ref( crv() ); // this should produce an ERROR
+    (void)r;
 }
 
 #else

test/ref_rv_fail4.cpp

@@ -16,6 +16,7 @@
 int main()
 {
     boost::reference_wrapper<int const> r = boost::cref( 2 ); // should fail
+    (void)r;
 }
 
 #else

test/ref_rv_fail5.cpp

@@ -20,6 +20,7 @@ X const crv() { return X(); }
 int main()
 {
     boost::reference_wrapper<X const> r = boost::cref( crv() ); // must fail
+    (void)r;
 }
 
 #else