Improve error reporting for type signatures

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

diff --git a/compiler/typecheck/TcRnTypes.lhs b/compiler/typecheck/TcRnTypes.lhs
index 9a08e9a..3c23921 100644 (file)
--- a/compiler/typecheck/TcRnTypes.lhs
+++ b/compiler/typecheck/TcRnTypes.lhs
@@ -306,11 +306,15 @@ data TcLclEnv             -- Changes as we move inside an expression
                -- Maintained during renaming, of course, but also during
                -- type checking, solely so that when renaming a Template-Haskell
                -- splice we have the right environment for the renamer.
                -- Maintained during renaming, of course, but also during
                -- type checking, solely so that when renaming a Template-Haskell
                -- splice we have the right environment for the renamer.

+               --
+               -- Used only for names bound within a value binding (bound by
+               -- lambda, case, where, let etc), but *not* for top-level names.
+               -- 
+               -- Does *not* include global name envt; may shadow it
+               -- Includes both ordinary variables and type variables;
+               -- they are kept distinct because tyvar have a different
+               -- occurrence contructor (Name.TvOcc)

                -- 
                -- 

-               --   Does *not* include global name envt; may shadow it
-               --   Includes both ordinary variables and type variables;
-               --   they are kept distinct because tyvar have a different
-               --   occurrence contructor (Name.TvOcc)

                -- We still need the unsullied global name env so that
                --   we can look up record field names
 
                -- We still need the unsullied global name env so that
                --   we can look up record field names