From: Simon Marlow <marlowsd@gmail.com>
Date: Sat, 4 Jun 2011 10:11:10 +0000 (+0100)
Subject: add comment
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=927df6486bc0dcb598b82702ca40c8fad0d9b25f

add comment
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diff --git a/compiler/main/GHC.hs b/compiler/main/GHC.hs
index 44ec3ff..0ecc09b 100644
--- a/compiler/main/GHC.hs
+++ b/compiler/main/GHC.hs
@@ -933,6 +933,10 @@ getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
 #ifdef GHCI
 getPackageModuleInfo hsc_env mdl = do
   mb_avails <- hscGetModuleExports hsc_env mdl
+     -- This is the only use of hscGetModuleExports.  Perhaps we could use
+     -- hscRnImportDecls instead, but that does a lot more than we need
+     -- (building instance environment, checking family instance consistency
+     -- etc.).
   case mb_avails of
     Nothing -> return Nothing
     Just avails -> do