[commit: ghc] master: Bring comments in TcGenGenerics up to date (b35e01c)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/b35e01c6c39d9f2d58009722e24d89049aa94287/ghc

>---------------------------------------------------------------

commit b35e01c6c39d9f2d58009722e24d89049aa94287
Author: Ryan Scott <ryan.gl.scott at gmail.com>
Date:   Fri Jul 15 14:17:24 2016 -0400

    Bring comments in TcGenGenerics up to date
    
    [ci skip]


>---------------------------------------------------------------

b35e01c6c39d9f2d58009722e24d89049aa94287
 compiler/typecheck/TcGenGenerics.hs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/compiler/typecheck/TcGenGenerics.hs b/compiler/typecheck/TcGenGenerics.hs
index a734ae8..5757e98 100644
--- a/compiler/typecheck/TcGenGenerics.hs
+++ b/compiler/typecheck/TcGenGenerics.hs
@@ -135,7 +135,8 @@ canDoGenerics :: TyCon -> Validity
 -- Check (a) from Note [Requirements for deriving Generic and Rep] is taken
 -- care of because canDoGenerics is applied to rep tycons.
 --
--- It returns Nothing if deriving is possible. It returns (Just reason) if not.
+-- It returns IsValid if deriving is possible. It returns (NotValid reason)
+-- if not.
 canDoGenerics tc
   = mergeErrors (
           -- Check (b) from Note [Requirements for deriving Generic and Rep].
@@ -221,7 +222,8 @@ explicitly, even though foldDataConArgs is also doing this internally.
 -- Checks (a) through (c) from Note [Requirements for deriving Generic and Rep]
 -- are taken care of by the call to canDoGenerics.
 --
--- It returns Nothing if deriving is possible. It returns (Just reason) if not.
+-- It returns IsValid if deriving is possible. It returns (NotValid reason)
+-- if not.
 canDoGenerics1 :: TyCon -> Validity
 canDoGenerics1 rep_tc =
   canDoGenerics rep_tc `andValid` additionalChecks