==================== Tidy Core ====================
Result size of Tidy Core
  = {terms: 17, types: 6, coercions: 0, joins: 0/0}

-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}
NatVal.$trModule4 :: GHC.Prim.Addr#
[GblId,
 Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 20 0}]
NatVal.$trModule4 = "main"#

-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}
NatVal.$trModule3 :: GHC.Types.TrName
[GblId,
 Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 10}]
NatVal.$trModule3 = GHC.Types.TrNameS NatVal.$trModule4

-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}
NatVal.$trModule2 :: GHC.Prim.Addr#
[GblId,
 Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 30 0}]
NatVal.$trModule2 = "NatVal"#

-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}
NatVal.$trModule1 :: GHC.Types.TrName
[GblId,
 Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 10}]
NatVal.$trModule1 = GHC.Types.TrNameS NatVal.$trModule2

-- RHS size: {terms: 3, types: 0, coercions: 0, joins: 0/0}
NatVal.$trModule :: GHC.Types.Module
[GblId,
 Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 10}]
NatVal.$trModule
  = GHC.Types.Module NatVal.$trModule3 NatVal.$trModule1

-- RHS size: {terms: 2, types: 0, coercions: 0, joins: 0/0}
foo :: Integer
[GblId,
 Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 10 10}]
foo = GHC.Num.Integer.IS 0#