--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/testsuite/gcc.dg/Wconversion-4.c Fri Oct 27 22:46:09 2017 +0900 @@ -0,0 +1,5 @@ +/* { dg-do compile } */ +/* { dg-options "-O2" } */ + +unsigned f(unsigned a) { return a + -1; } +