mkdir $WORK/out
txtar-addmod $WORK/out github.com/gobin-testrepos/simple-main
! stdout .+
! stderr .+
exists $WORK/out/github.com_gobin-testrepos_simple-main_v1.0.0.txt
! grep foobar $WORK/out/github.com_gobin-testrepos_simple-main_v1.0.0.txt

txtar-addmod -all $WORK/out github.com/gobin-testrepos/simple-main
grep '-- foobar --' $WORK/out/github.com_gobin-testrepos_simple-main_v1.0.0.txt