.type trcbck.tst
.type *** Many errors are generated
.type
.first title TRACEBACK test
.ps 20,70,0,0,1 .header spacing 1
.nf.keep
.error level 1
.req "trc1.tst"
.error level 1
.type *** errors in substitutions
.type
.DEFINE SUBSTITUTE /a1/Substitute 1'A $a2
.DEFINE SUBSTITUTE /a2/Substitute 2'A $a3
.DEFINE SUBSTITUTE /a3/Substitute 3'A
.flags escape '
.flags substitute
$a1