#10030: packageName for GHC.Generics.Datatype -------------------------------------+------------------------------------- Reporter: phadej | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.4 Component: | Operating System: Unknown/Multiple libraries/base | Type of failure: None/Unknown Keywords: | Blocked By: Architecture: | Related Tickets: Unknown/Multiple | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Seems it's perfectly ok to have the data type of the same name in the same module, but different packages. Yet used in the same module: {{{ {-# LANGUAGE PackageImports #-} {-# LANGUAGE RankNTypes #-} module Data.Foo where import "void" Data.Void as A import Data.Void as B foo :: A.Void -> a foo = absurd bar :: B.Void -> a bar x = x () }}} {{{ {-# LANGUAGE RankNTypes #-} module Data.Void where type Void = forall a b. a -> b }}} https://gist.github.com/phadej/8b628d579ddf6958d937 motivated by: http://stackoverflow.com/questions/28159068/packagename- with-ghc-generics I'd propose to change `Datatype` class to be: {{{ class Datatype d where -- | The name of the datatype (unqualified) datatypeName :: t d (f :: * -> *) a -> [Char] -- | The fully-qualified name of the module where the type is declared moduleName :: t d (f :: * -> *) a -> [Char] -- | The package name of the module where the type is declared packageName :: t d (f :: * -> *) a -> [Char] -- | Marks if the datatype is actually a newtype isNewtype :: t d (f :: * -> *) a -> Bool isNewtype _ = False }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10030 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler