[commit: ghc] master: Document SumTyCon (26cfe29)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/26cfe291c5d581299a40ae5177979ddf1b465ec0/ghc

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

commit 26cfe291c5d581299a40ae5177979ddf1b465ec0
Author: Simon Jakobi <simon.jakobi at gmail.com>
Date:   Mon Apr 2 21:29:02 2018 +0200

    Document SumTyCon


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26cfe291c5d581299a40ae5177979ddf1b465ec0
 compiler/types/TyCon.hs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/types/TyCon.hs b/compiler/types/TyCon.hs
index 072e397..67c7b1b 100644
--- a/compiler/types/TyCon.hs
+++ b/compiler/types/TyCon.hs
@@ -863,6 +863,7 @@ data AlgTyConRhs
                                    -- tuple?
     }
 
+  -- | An unboxed sum type.
   | SumTyCon {
         data_cons :: [DataCon],
         data_cons_size :: Int  -- ^ Cached value: length data_cons