Remove LazyUniqFM; fixes trac #3880

[ghc-hetmet.git] / compiler / typecheck / TcRnTypes.lhs

diff --git a/compiler/typecheck/TcRnTypes.lhs b/compiler/typecheck/TcRnTypes.lhs
index a91e95e..2f54e42 100644 (file)
--- a/compiler/typecheck/TcRnTypes.lhs
+++ b/compiler/typecheck/TcRnTypes.lhs
@@ -56,7 +56,7 @@ import NameSet
 import Var
 import VarEnv
 import Module
-import LazyUniqFM
+import UniqFM
 import SrcLoc
 import VarSet
 import ErrUtils
@@ -233,7 +233,11 @@ data TcGblEnv
         tcg_rn_imports :: [LImportDecl Name],
                -- Keep the renamed imports regardless.  They are not 
                -- voluminous and are needed if you want to report unused imports
+
         tcg_used_rdrnames :: TcRef (Set RdrName),
+               -- The set of used *imported* (not locally-defined) RdrNames
+               -- Used only to report unused import declarations
+
        tcg_rn_decls :: Maybe (HsGroup Name),
           -- ^ Renamed decls, maybe.  @Nothing@ <=> Don't retain renamed
           -- decls.