GHC.Hs.Extension

This instance tries to construct HieAST nodes which include the type of the expression. It is not yet possible to do this efficiently for all expression forms, so we skip filling in the type for those inputs.

See Note [Computing the type of every node in the tree]

Only for module exports, not module imports.

module M (a, b, c) where -- use on this [LIE GhcPs] import I (a, b, c) -- do not use here!

Imports cannot have documentation comments anyway.

This instance is meant for debug-printing purposes. If you wish to pretty-print an application of HsArgs, use pprHsArgsApp instead.

Marks that a field uses the GhcRn variant even when the pass parameter is GhcTc. Useful for storing HsTypes in GHC.Hs.Exprs, say, because HsType GhcTc should never occur. See Note [NoGhcTc]

fixity (filled in by the renamer), for forms that were converted from OpApp's by the renamer

After the renamer (but before the type-checker), the FunBind extension field contains the locally-bound free variables of this defn. See Note [Bind free vars]

After the type-checker, the FunBind extension field contains the ticks to put on the rhs, if any, and a coercion from the type of the MatchGroup to the type of the Id. Example:

     f :: Int -> forall a. a -> a
     f x y = y

Then the MatchGroup will have type (Int -> a' -> a') (with a free type variable a'). The coercion will take a CoreExpr of this type and convert it to a CoreExpr of type Int -> forall a'. a' -> a' Notice that the coercion captures the free a'.

Expression Hole. See Note [Holes in expressions].