bound-1.0.2: Making de Bruijn Succ Less

Portability portable experimental Edward Kmett Trustworthy

Bound.Name

Description

The problem with locally nameless approaches is that original names are often useful for error reporting, or to allow for the user in an interactive theorem prover to convey some hint about the domain. A Name n b is a value b supplemented with a (discardable) name that may be useful for error reporting purposes. In particular, this name does not participate in comparisons for equality.

This module is not exported from Bound by default. You need to explicitly import it, due to the fact that Name is a pretty common term in other people's code.

Synopsis

# Documentation

data Name n b Source

We track the choice of Name n as a forgettable property that does not affect the result of (==) or compare.

To compare names rather than values, use (on compare name) instead.

Constructors

 Name n b

Instances

 Typeable2 Name Bitraversable Name Bifunctor Name Bifoldable Name Serial2 Name Hashable2 Name Eq2 Name Ord2 Name Show2 Name Read2 Name Functor (Name n) Foldable (Name n) Traversable (Name n) Serial b => Serial1 (Name b) Comonad (Name n) Hashable1 (Name n) Eq1 (Name b) Ord1 (Name b) Show b => Show1 (Name b) Read b => Read1 (Name b) Eq b => Eq (Name n b) (Data n, Data b) => Data (Name n b) Ord b => Ord (Name n b) (Read n, Read b) => Read (Name n b) (Show n, Show b) => Show (Name n b) Generic (Name n b) (Binary b, Binary a) => Binary (Name b a) (Serial b, Serial a) => Serial (Name b a) (Serialize b, Serialize a) => Serialize (Name b a) Hashable a => Hashable (Name n a)

_Name :: (Profunctor p, Functor f) => p (n, a) (f (m, b)) -> p (Name n a) (f (Name m b))Source

This provides an Iso that can be used to access the parts of a Name.

_Name :: Iso (Name n a) (Name m b) (n, a) (m, b)

name :: Name n b -> nSource

Extract the name.

abstractName :: Monad f => (a -> Maybe b) -> f a -> Scope (Name a b) f aSource

Abstraction, capturing named bound variables.

abstract1Name :: (Monad f, Eq a) => a -> f a -> Scope (Name a ()) f aSource

Abstract over a single variable

instantiateName :: (Monad f, Comonad n) => (b -> f a) -> Scope (n b) f a -> f aSource

Enter a scope, instantiating all bound variables, but discarding (comonadic) meta data, like its name

instantiate1Name :: Monad f => f a -> Scope n f a -> f aSource

Enter a Scope that binds one (named) variable, instantiating it.

instantiate1Name = instantiate1