




Description 
A module concerned with finding the free variables of an expression.


Synopsis 




Free variables of expressions and binding groups


exprFreeVars :: CoreExpr > VarSet 
Find all locallydefined free Ids or type variables in an expression


exprsFreeVars :: [CoreExpr] > VarSet 
Find all locallydefined free Ids or type variables in several expressions


bindFreeVars :: CoreBind > VarSet 
Find all locally defined free Ids in a binding group


Selective free variables of expressions


type InterestingVarFun = Var > Bool 
Predicate on possible free variables: returns True iff the variable is interesting


exprSomeFreeVars 


exprsSomeFreeVars :: InterestingVarFun > [CoreExpr] > VarSet 
Finds free variables in several expressions selected by a predicate


exprFreeNames :: CoreExpr > NameSet 
Finds the free external names of an expression, notably
including the names of type constructors (which of course do not show
up in exprFreeVars).


exprsFreeNames :: [CoreExpr] > NameSet 
Finds the free external names of several expressions: see exprFreeNames for details


Free variables of Rules, Vars and Ids


idRuleVars :: Id > VarSet 

idFreeVars :: Id > VarSet 

varTypeTyVars :: Var > TyVarSet 

ruleRhsFreeVars :: CoreRule > VarSet 
Those variables free in the right hand side of a rule


rulesFreeVars :: [CoreRule] > VarSet 
Those variables free in the right hand side of several rules


ruleLhsFreeNames :: CoreRule > NameSet 
Similar to exprFreeNames. However, this is used when deciding whether
a rule is an orphan. In particular, suppose that T is defined in this
module; we want to avoid declaring that a rule like:
fromIntegral T = fromIntegral_T
is an orphan. Of course it isn't, and declaring it an orphan would
make the whole module an orphan module, which is bad.


ruleLhsFreeIds :: CoreRule > VarSet 
This finds all locallydefined free Ids on the left hand side of a rule


Core syntax tree annotation with free variables


type CoreExprWithFVs = AnnExpr Id VarSet 
Every node in an expression annotated with its
(nonglobal) free variables, both Ids and TyVars


type CoreBindWithFVs = AnnBind Id VarSet 
Every node in a binding group annotated with its
(nonglobal) free variables, both Ids and TyVars


freeVars :: CoreExpr > CoreExprWithFVs 
Annotate a CoreExpr with its (nonglobal) free type and value variables at every tree node


freeVarsOf :: CoreExprWithFVs > IdSet 
Inverse function to freeVars


Produced by Haddock version 2.4.2 