FunctorCombo.Holey

Filling and extracting derivatives (one-hole contexts)

Documentation

type Loc f a = (Der f a, a)

Location, i.e., one-hole context and a value for the hole.

class Functor f => Holey f where

Filling and creating one-hole contexts

Methods

fillC

Arguments

:: Der f a

-> a

-> f a

Fill a hole

extract

Arguments

:: f a

-> f (Loc f a)

All extractions

Instances

Holey Id

Holey (Const z)

(Holey f, Holey g) => Holey ((:.) g f)

(Holey f, Holey g) => Holey ((:+:) f g)

(Holey f, Holey g) => Holey ((:*:) f g)

fill :: Holey f => Loc f a -> f a

Alternative interface for fillC.