module Internal.Evidence (evByFiat) where

import GHC.Tc.Types.Evidence (EvTerm(..))
import GHC.Core.TyCo.Rep (UnivCoProvenance (..))

import GhcApi.GhcPlugins

-- | The 'EvTerm' equivalent for 'Unsafe.unsafeCoerce'

evByFiat :: String -- ^ Name the coercion should have

         -> Type   -- ^ The LHS of the equivalence relation (~)

         -> Type   -- ^ The RHS of the equivalence relation (~)

         -> EvTerm
evByFiat :: String -> Type -> Type -> EvTerm
evByFiat String
name Type
t1 Type
t2 =
  EvExpr -> EvTerm
EvExpr forall a b. (a -> b) -> a -> b
$ forall b. Coercion -> Expr b
Coercion forall a b. (a -> b) -> a -> b
$ UnivCoProvenance -> Role -> Type -> Type -> Coercion
mkUnivCo (String -> UnivCoProvenance
PluginProv String
name) Role
Nominal Type
t1 Type
t2