Safe Haskell	None
Language	Haskell2010

GHC.Tc.Errors.Hole.Plugin

Synopsis

type CandPlugin = TypedHole -> [HoleFitCandidate] -> TcM [HoleFitCandidate]
type FitPlugin = TypedHole -> [HoleFit] -> TcM [HoleFit]
data HoleFitPlugin = HoleFitPlugin {
- candPlugin :: CandPlugin
- fitPlugin :: FitPlugin
}
data HoleFitPluginR = HoleFitPluginR {
- hfPluginInit :: TcM (TcRef s)
- hfPluginRun :: TcRef s -> HoleFitPlugin
- hfPluginStop :: TcRef s -> TcM ()
}

Documentation

type CandPlugin = TypedHole -> [HoleFitCandidate] -> TcM [HoleFitCandidate] Source #

A plugin for modifying the candidate hole fits *before* they're checked.

type FitPlugin = TypedHole -> [HoleFit] -> TcM [HoleFit] Source #

A plugin for modifying hole fits *after* they've been found.

data HoleFitPlugin Source #

A HoleFitPlugin is a pair of candidate and fit plugins.

Constructors

HoleFitPlugin
Fields candPlugin :: CandPlugin fitPlugin :: FitPlugin

data HoleFitPluginR Source #

HoleFitPluginR adds a TcRef to hole fit plugins so that plugins can track internal state. Note the existential quantification, ensuring that the state cannot be modified from outside the plugin.

Constructors

HoleFitPluginR
Fields hfPluginInit :: TcM (TcRef s) Initializes the TcRef to be passed to the plugin hfPluginRun :: TcRef s -> HoleFitPlugin The function defining the plugin itself hfPluginStop :: TcRef s -> TcM () Cleanup of state, guaranteed to be called even on error