- fix bug where we did not reject invalid classes like '[[:alpha'
- debloat while at it:
   text    data     bss     dec     hex filename
   1554       0      19    1573     625 tr.o.oorig
   1357       0      16    1373     55d tr.o
diff --git a/testsuite/tr/tr-d-works b/testsuite/tr/tr-d-works
index d939e8b..a86bfbd 100644
--- a/testsuite/tr/tr-d-works
+++ b/testsuite/tr/tr-d-works
@@ -1,4 +1,4 @@
 echo testing | tr -d aeiou > logfile.gnu
 echo testing | busybox tr -d aeiou > logfile.bb
 
-cmp logfile.gnu logfile.bb
+diff -u logfile.gnu logfile.bb