f: 42
CallStack (from -prof):
  Main.f (callstack002.hs:10:7-43)
  Main.map.go (callstack002.hs:15:21-23)
  Main.map.go (callstack002.hs:15:21-34)
  Main.map (callstack002.hs:13:12-16)
  Main.main.xs (callstack002.hs:18:12-24)
  Main.CAF (<entire-module>)
f: 43
CallStack (from -prof):
  Main.f (callstack002.hs:10:7-43)
  Main.map.go (callstack002.hs:15:21-23)
  Main.map.go (callstack002.hs:15:21-34)
  Main.map (callstack002.hs:13:12-16)
  Main.main.xs (callstack002.hs:18:12-24)
  Main.CAF (<entire-module>)