6 -- load the program (all interpreted)
9 -- reloading should do nothing
12 -- make sure `main' works
15 -- touch a module + recompile
19 -- make sure `main' still works
23 :! $HC $HC_OPTS -no-recomp -c D.hs
27 -- change A, recompile & reload
29 :! $HC $HC_OPTS -no-recomp -c D.hs
33 -- make sure we're picking up the new D, via B