The third argument should prompt an error message
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rx "say word(foo,1,bar)"
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0000: 464F524D 00000088 50544348 56455253 FORM....PTCHVERS
0010: 00000024 00000300 53415320 496E7374 ...$....SAS Inst
0020: 69747574 652C2049 6E632E20 50617463 itute, Inc. Patc
0030: 68205636 2E353000 494E5046 0000001C h V6.50.INPF....
0040: 002866C2 00008AD8 3A726578 78737973 .(f?...?:rexxsys
0050: 6C69622E 6C696272 61727900 4F555446 lib.library.OUTF
0060: 0000001A 002866B2 00008AD8 72657878 .....(f?...?rexx
0070: 7379736C 69622E6C 69627261 72795053 syslib.libraryPS
0080: 45510000 000A5571 9DA05519 3A000000 EQ....Uq.?U.:...