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