(fail-a): Adjust exit status to match new expr behavior, for status 2 versus 3.

(fail-a): Adjust exit status to match new expr behavior, for status 2 versus 3.
(anchor): New test.
(bre1, bre2, bre3, bre4, bre5, bre6, bre7, bre8, bre9, bre10):
(bre11, bre12, bre13, bre14, bre15, bre16, bre17, bre18, bre19, bre20):
(bre21, bre22, bre23, bre24, bre25, bre26, bre27, bre28, bre29, bre30):
(bre31, bre32, bre33, bre34, bre35, bre36, bre37, bre38, bre39, bre40):
(bre41, bre42, bre43, bre44, bre45, bre46, bre47, bre48, bre49, bre50):
(bre51, bre52, bre53, bre54, bre55, bre56, bre57, bre58, bre59, bre60):
(bre61, bre62): New tests.