-ddump-minimal-imports creates incorrect imports for associated types

If you have a module URL.hs:

{-# LANGUAGE TypeFamilies #-}

module URL (ToURL(toURL, nullURL, errorURL), URLT) where

class ToURL a where
    type URLT a
    toURL :: a -> URLT a
    nullURL :: a
    errorURL :: a -> URLT a

And a module that uses it Tmp.hs:

{-# LANGUAGE FlexibleContexts #-}
module Tmp ( clean ) where

import Data.Char (isAlphaNum)
import Data.List (dropWhile)
import URL

clean :: (ToURL url, Show (URLT url)) => url -> String
clean = filter isAlphaNum . show . toURL

when you run ghc -ddump-minimal-imports Tmp.hs the resulting Tmp.imports will contain the line

import URL ( ToURL(URLT, toURL) )

but it should contain

import URL ( ToURL(toURL), URLT )

This affects both associated type and associated type synonym declarations.

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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