Add comments from Trac #12768
authorSimon Peyton Jones <simonpj@microsoft.com>
Thu, 3 Nov 2016 14:54:01 +0000 (14:54 +0000)
committerSimon Peyton Jones <simonpj@microsoft.com>
Fri, 4 Nov 2016 09:17:33 +0000 (09:17 +0000)
commite43f05b62053f4742b105636b7ebf4ce8486b13b
treeefc9aff555790ff60f1ebd5f351094f9d7db7a2b
parenta977c96537bb7077c6445f02db98636b150e6e14
Add comments from Trac #12768
compiler/typecheck/TcGenDeriv.hs