[commit: ghc] master: Remove imv_empty from ImportedModsVal (5a86292)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/5a86292872f78da2289df1c711b407de0a0edd0d/ghc

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

commit 5a86292872f78da2289df1c711b407de0a0edd0d
Author: Joachim Breitner <mail at joachim-breitner.de>
Date:   Wed Nov 11 12:58:40 2015 +0100

    Remove imv_empty from ImportedModsVal
    
    it seems that this field is never used.


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

5a86292872f78da2289df1c711b407de0a0edd0d
 compiler/main/HscTypes.hs       |  1 -
 compiler/rename/RnNames.hs      |  7 ++-----
 compiler/typecheck/TcRnTypes.hs | 23 ++---------------------
 3 files changed, 4 insertions(+), 27 deletions(-)

diff --git a/compiler/main/HscTypes.hs b/compiler/main/HscTypes.hs
index 31fe778..849c803 100644
--- a/compiler/main/HscTypes.hs
+++ b/compiler/main/HscTypes.hs
@@ -1033,7 +1033,6 @@ type ImportedMods = ModuleEnv [ImportedModsVal]
 data ImportedModsVal
  = ImportedModsVal {
         imv_name :: ModuleName,         -- ^ The name the module is imported with
-        imv_empty :: Bool,              -- ^ whether it is an "import Foo ()" import
         imv_span :: SrcSpan,            -- ^ the source span of the whole import
         imv_is_safe :: IsSafeImport,    -- ^ whether this is a safe import
         imv_is_hiding :: Bool,          -- ^ whether this is an "hiding" import
diff --git a/compiler/rename/RnNames.hs b/compiler/rename/RnNames.hs
index 44c7c17..8d4986e 100644
--- a/compiler/rename/RnNames.hs
+++ b/compiler/rename/RnNames.hs
@@ -270,10 +270,8 @@ rnImportDecl this_mod
 
     let gbl_env = mkGlobalRdrEnv gres
 
-        -- import_all == True <=> import M ()
-        (is_hiding, import_all) = case imp_details of
-                        Just (is_hiding, L _ ls) -> (is_hiding, not is_hiding && null ls)
-                        _                        -> (False, False)
+        is_hiding | Just (True,_) <- imp_details = True
+                  | otherwise                    = False
 
         -- should the import be safe?
         mod_safe' = mod_safe
@@ -282,7 +280,6 @@ rnImportDecl this_mod
 
     let imv = ImportedModsVal
             { imv_name        = qual_mod_name
-            , imv_empty       = import_all
             , imv_span        = loc
             , imv_is_safe     = mod_safe'
             , imv_is_hiding   = is_hiding
diff --git a/compiler/typecheck/TcRnTypes.hs b/compiler/typecheck/TcRnTypes.hs
index 5c3727e..06ab9c2 100644
--- a/compiler/typecheck/TcRnTypes.hs
+++ b/compiler/typecheck/TcRnTypes.hs
@@ -969,27 +969,8 @@ data ImportAvails
           --      = ModuleEnv [ImportedModsVal],
           -- ^ Domain is all directly-imported modules
           --
-          -- 'imv_name' is what the module was imported as, e.g. in
-          -- @
-          --     import Foo as Bar
-          -- @
-          -- it is @Bar at .
-          --
-          -- The first 'Bool' means:
-          --
-          --  - @True@ => import was @import Foo ()@
-          --
-          --  - @False@ => import was some other form
-          --
-          -- Used
-          --
-          --   (a) to help construct the usage information in the interface
-          --       file; if we import something we need to recompile if the
-          --       export version changes
-          --
-          --   (b) to specify what child modules to initialise
-          --
-          -- The second 'Bool' means that the module is safe (see rnImportDecl)
+          -- See the documentaion on ImportedModsVal in HscTypes for the
+          -- meaning of the fields.
           --
           -- We need a full ModuleEnv rather than a ModuleNameEnv here,
           -- because we might be importing modules of the same name from