[project @ 2005-01-27 10:44:00 by simonpj]

--------------------------------------------
          Replace hi-boot files with hs-boot files
  	--------------------------------------------

This major commit completely re-organises the way that recursive modules
are dealt with.

  * It should have NO EFFECT if you do not use recursive modules

  * It is a BREAKING CHANGE if you do

====== Warning: .hi-file format has changed, so if you are
======		updating into an existing HEAD build, you'll
======		need to make clean and re-make


The details:  [documentation still to be done]

* Recursive loops are now broken with Foo.hs-boot (or Foo.lhs-boot),
  not Foo.hi-boot

* An hs-boot files is a proper source file.  It is compiled just like
  a regular Haskell source file:
	ghc Foo.hs		generates Foo.hi, Foo.o
	ghc Foo.hs-boot		generates Foo.hi-boot, Foo.o-boot

* hs-boot files are precisely a subset of Haskell. In particular:
	- they have the same import, export, and scoping rules
	- errors (such as kind errors) in hs-boot files are checked
  You do *not* need to mention the "original" name of something in
  an hs-boot file, any more than you do in any other Haskell module.

* The Foo.hi-boot file generated by compiling Foo.hs-boot is a machine-
  generated interface file, in precisely the same format as Foo.hi

* When compiling Foo.hs, its exports are checked for compatibility with
  Foo.hi-boot (previously generated by compiling Foo.hs-boot)

* The dependency analyser (ghc -M) knows about Foo.hs-boot files, and
  generates appropriate dependencies.  For regular source files it
  generates
	Foo.o : Foo.hs
	Foo.o : Baz.hi		-- Foo.hs imports Baz
	Foo.o : Bog.hi-boot	-- Foo.hs source-imports Bog

  For a hs-boot file it generates similar dependencies
	Bog.o-boot : Bog.hs-boot
	Bog.o-boot : Nib.hi	-- Bog.hs-boto imports Nib

* ghc -M is also enhanced to use the compilation manager dependency
  chasing, so that
	ghc -M Main
  will usually do the job.  No need to enumerate all the source files.

* The -c flag is no longer a "compiler mode". It simply means "omit the
  link step", and synonymous with -no-link.

ghc/compiler/Makefile

@@ -86,6 +86,10 @@ WAYS=$(GhcCompilerWays)
 #  - create a link tree.  The problem with requiring link trees is that 
 #    Windows doesn't support symbolic links.
 
+ifeq "$(stage)" ""
+stage=1
+endif
+
 boot ::
 	$(MKDIRHIER) stage$(stage)
 	for i in $(ALL_DIRS); do \
@@ -100,6 +104,8 @@ boot ::
 # PS: 'ln -s foo baz' takes 'foo' relative to the path to 'baz'
 #     whereas 'cp foo baz' treats the two paths independently.
 #     Hence the "../.." in the ln command line
+ifeq "$(stage)" "1"
+ifeq "$(ghc_ge_603)" "NO"
 ifeq "$(HOSTPLATFORM)" "i386-unknown-mingw32"
 	for i in */*hi-boot*; do \
 	    cp -u -f $$i stage$(stage)/$$i; \
@@ -109,9 +115,7 @@ else
 	    $(LN_S) -f ../../$$i stage$(stage)/$$i || true ; \
 	done
 endif
-
-ifeq "$(stage)" ""
-stage=1
+endif
 endif
 
 ifeq "$(stage)" "1"

ghc/compiler/basicTypes/DataCon.lhs-boot

+\begin{code}
+module DataCon where
+import Name( Name )
+
+data DataCon
+dataConName      :: DataCon -> Name
+isVanillaDataCon :: DataCon -> Bool
+\end{code}

ghc/compiler/basicTypes/IdInfo.lhs-boot

+\begin{code}
+module IdInfo where
+
+data IdInfo
+data GlobalIdDetails
+
+notGlobalId :: GlobalIdDetails
+seqIdInfo   :: IdInfo -> ()
+\end{code}
\ No newline at end of file

ghc/compiler/basicTypes/MkId.lhs-boot

+\begin{code}
+module MkId where
+import Name( Name )
+import DataCon( DataCon, DataConIds )
+
+mkDataConIds :: Name -> Name -> DataCon -> DataConIds
+\end{code}
+
+

ghc/compiler/basicTypes/Module.lhs

@@ -15,7 +15,7 @@ module Module
     , pprModule			-- :: ModuleName -> SDoc
 
     , ModLocation(..),
-    , showModMsg
+    , addBootSuffix, addBootSuffix_maybe, addBootSuffixLocn,
 
     , moduleString		-- :: ModuleName -> EncodedString
     , moduleUserString		-- :: ModuleName -> UserString
@@ -30,7 +30,7 @@ module Module
     , delModuleEnvList, delModuleEnv, plusModuleEnv, lookupModuleEnv
     , lookupWithDefaultModuleEnv, mapModuleEnv, mkModuleEnv, emptyModuleEnv
     , moduleEnvElts, unitModuleEnv, isEmptyModuleEnv, foldModuleEnv
-    , extendModuleEnv_C
+    , extendModuleEnv_C, filterModuleEnv,
 
     , ModuleSet, emptyModuleSet, mkModuleSet, moduleSetElts, extendModuleSet, elemModuleSet
 
@@ -40,11 +40,9 @@ module Module
 import OccName
 import Outputable
 import Unique		( Uniquable(..) )
-import Maybes		( expectJust )
 import UniqFM
 import UniqSet
 import Binary
-import StringBuffer	( StringBuffer )
 import FastString
 \end{code}
 
@@ -58,15 +56,9 @@ import FastString
 data ModLocation
    = ModLocation {
         ml_hs_file   :: Maybe FilePath,
-		-- the source file, if we have one.  Package modules
+		-- The source file, if we have one.  Package modules
 		-- probably don't have source files.
 
-        ml_hspp_file :: Maybe FilePath,
-		-- filename of preprocessed source, if we have
-		-- preprocessed it.
-	ml_hspp_buf  :: Maybe StringBuffer,
-		-- the actual preprocessed source, maybe.
-
         ml_hi_file   :: FilePath,
 		-- Where the .hi file is, whether or not it exists
 		-- yet.  Always of form foo.hi, even if there is an
@@ -81,18 +73,6 @@ data ModLocation
 
 instance Outputable ModLocation where
    ppr = text . show
-
--- Rather a gruesome function to have in Module
-
-showModMsg :: Bool -> Module -> ModLocation -> String
-showModMsg use_object mod location =
-    mod_str ++ replicate (max 0 (16 - length mod_str)) ' '
-    ++" ( " ++ expectJust "showModMsg" (ml_hs_file location) ++ ", "
-    ++ (if use_object
-	  then ml_obj_file location
-	  else "interpreted")
-    ++ " )"
- where mod_str = moduleUserString mod
 \end{code}
 
 For a module in another package, the hs_file and obj_file
@@ -103,6 +83,23 @@ correspond to actual files yet: for example, even if the object
 file doesn't exist, the ModLocation still contains the path to
 where the object file will reside if/when it is created.
 
+\begin{code}
+addBootSuffix :: FilePath -> FilePath
+-- Add the "-boot" suffix to .hs, .hi and .o files
+addBootSuffix path = path ++ "-boot"
+
+addBootSuffix_maybe :: Bool -> FilePath -> FilePath
+addBootSuffix_maybe is_boot path
+ | is_boot   = addBootSuffix path
+ | otherwise = path
+
+addBootSuffixLocn :: ModLocation -> ModLocation
+addBootSuffixLocn locn
+  = locn { ml_hs_file  = fmap addBootSuffix (ml_hs_file locn)
+	 , ml_hi_file  = addBootSuffix (ml_hi_file locn)
+	 , ml_obj_file = addBootSuffix (ml_obj_file locn) }
+\end{code}
+
 
 %************************************************************************
 %*									*
@@ -188,7 +185,9 @@ lookupModuleEnv      :: ModuleEnv a -> Module     -> Maybe a
 lookupWithDefaultModuleEnv :: ModuleEnv a -> a -> Module -> a
 elemModuleEnv        :: Module -> ModuleEnv a -> Bool
 foldModuleEnv        :: (a -> b -> b) -> b -> ModuleEnv a -> b
+filterModuleEnv      :: (a -> Bool) -> ModuleEnv a -> ModuleEnv a
 
+filterModuleEnv	    = filterUFM
 elemModuleEnv       = elemUFM
 extendModuleEnv     = addToUFM
 extendModuleEnv_C   = addToUFM_C

ghc/compiler/basicTypes/Module.lhs-boot

+\begin{code}
+module Module where
+
+data Module
+\end{code}
+

ghc/compiler/basicTypes/Name.lhs-boot

+\begin{code}
+module Name where
+
+data Name
+\end{code}

ghc/compiler/basicTypes/OccName.lhs-boot

+\begin{code}
+module OccName where
+
+data OccName
+\end{code}

ghc/compiler/codeGen/CgBindery.lhs-boot

+\begin{code}
+module CgBindery where
+import VarEnv( IdEnv )
+
+data CgIdInfo
+data VolatileLoc
+data StableLoc
+type CgBindings = IdEnv CgIdInfo
+
+nukeVolatileBinds :: CgBindings -> CgBindings
+\end{code}
\ No newline at end of file

ghc/compiler/codeGen/CgExpr.lhs-boot

+\begin{code}
+module CgExpr where
+import StgSyn( StgExpr )
+import CgMonad( Code )
+
+cgExpr :: StgExpr -> Code
+\end{code}

ghc/compiler/codeGen/ClosureInfo.lhs-boot

+\begin{code}
+module ClosureInfo where
+
+data LambdaFormInfo
+data ClosureInfo
+\end{code}
\ No newline at end of file

ghc/compiler/deSugar/Desugar.lhs

@@ -9,6 +9,7 @@ module Desugar ( deSugar, deSugarExpr ) where
 #include "HsVersions.h"
 
 import CmdLineOpts	( DynFlag(..), DynFlags(..), dopt, opt_SccProfilingOn )
+import DriverPhases	( isHsBoot )
 import HscTypes		( ModGuts(..), ModGuts, HscEnv(..), GhciMode(..),
 			  Dependencies(..), TypeEnv, IsBootInterface )
 import HsSyn		( RuleDecl(..), RuleBndr(..), HsExpr(..), LHsExpr,
@@ -59,6 +60,7 @@ deSugar :: HscEnv -> TcGblEnv -> IO (Bag WarnMsg, Maybe ModGuts)
 
 deSugar hsc_env 
         tcg_env@(TcGblEnv { tcg_mod       = mod,
+			    tcg_src	  = hsc_src,
 		    	    tcg_type_env  = type_env,
 		    	    tcg_imports   = imports,
 		    	    tcg_exports   = exports,
@@ -146,6 +148,7 @@ deSugar hsc_env
 
 	     mod_guts = ModGuts {	
 		mg_module   = mod,
+		mg_boot	    = isHsBoot hsc_src,
 		mg_exports  = exports,
 		mg_deps	    = deps,
 		mg_usages   = usages,

ghc/compiler/deSugar/DsExpr.lhs-boot

+\begin{code}
+module DsExpr where
+import HsSyn	( HsExpr, LHsExpr, HsBindGroup )
+import Var  	( Id )
+import DsMonad	( DsM )
+import CoreSyn	( CoreExpr )
+
+dsExpr  :: HsExpr  Id -> DsM CoreExpr
+dsLExpr :: LHsExpr Id -> DsM CoreExpr
+dsLet   :: [HsBindGroup Id] -> CoreExpr -> DsM CoreExpr
+\end{code}

ghc/compiler/deSugar/DsMonad.lhs

@@ -20,14 +20,19 @@ module DsMonad (
 
 	DsMetaEnv, DsMetaVal(..), dsLookupMetaEnv, dsExtendMetaEnv,
 
-	dsWarn, 
-	DsWarning,
-	DsMatchContext(..)
+	-- Warnings
+	DsWarning, dsWarn, 
+
+	-- Data types
+	DsMatchContext(..),
+	EquationInfo(..), MatchResult(..), 
+	CanItFail(..), orFail
     ) where
 
 #include "HsVersions.h"
 
 import TcRnMonad
+import CoreSyn		( CoreExpr )
 import HsSyn		( HsExpr, HsMatchContext, Pat )
 import TcIface		( tcIfaceGlobal )
 import RdrName		( GlobalRdrEnv )
@@ -56,6 +61,49 @@ import DATA_IOREF	( newIORef, readIORef )
 infixr 9 `thenDs`
 \end{code}
 
+%************************************************************************
+%*									*
+		Data types for the desugarer
+%*									*
+%************************************************************************
+
+\begin{code}
+data DsMatchContext
+  = DsMatchContext (HsMatchContext Name) [Pat Id] SrcSpan
+  | NoMatchContext
+  deriving ()
+
+data EquationInfo
+  = EqnInfo { eqn_pats :: [Pat Id],    	-- The patterns for an eqn
+	      eqn_rhs  :: MatchResult }	-- What to do after match
+
+-- The semantics of (match vs (EqnInfo wrap pats rhs)) is the MatchResult
+--	\fail. wrap (case vs of { pats -> rhs fail })
+-- where vs are not in the domain of wrap
+
+
+-- A MatchResult is an expression with a hole in it
+data MatchResult
+  = MatchResult
+	CanItFail	-- Tells whether the failure expression is used
+	(CoreExpr -> DsM CoreExpr)
+			-- Takes a expression to plug in at the
+			-- failure point(s). The expression should
+			-- be duplicatable!
+
+data CanItFail = CanFail | CantFail
+
+orFail CantFail CantFail = CantFail
+orFail _        _	 = CanFail
+\end{code}
+
+
+%************************************************************************
+%*									*
+		Monad stuff
+%*									*
+%************************************************************************
+
 Now the mondo monad magic (yes, @DsM@ is a silly name)---carry around
 a @UniqueSupply@ and some annotations, which
 presumably include source-file location information:
@@ -129,6 +177,12 @@ initDs hsc_env mod rdr_env type_env thing_inside
     mk_warn (loc,sdoc) = mkWarnMsg loc print_unqual sdoc
 \end{code}
 
+%************************************************************************
+%*									*
+		Operations in the monad
+%*									*
+%************************************************************************
+
 And all this mysterious stuff is so we can occasionally reach out and
 grab one or more names.  @newLocalDs@ isn't exported---exported
 functions are defined with it.  The difference in name-strings makes
@@ -222,15 +276,3 @@ dsExtendMetaEnv menv thing_inside
 \end{code}
 
 
-%************************************************************************
-%*									*
-\subsection{Type synonym @EquationInfo@ and access functions for its pieces}
-%*									*
-%************************************************************************
-
-\begin{code}
-data DsMatchContext
-  = DsMatchContext (HsMatchContext Name) [Pat Id] SrcSpan
-  | NoMatchContext
-  deriving ()
-\end{code}

ghc/compiler/deSugar/DsUtils.lhs

@@ -187,14 +187,6 @@ The ``equation info'' used by @match@ is relatively complicated and
 worthy of a type synonym and a few handy functions.
 
 \begin{code}
-data EquationInfo
-  = EqnInfo { eqn_pats :: [Pat Id],    	-- The patterns for an eqn
-	      eqn_rhs  :: MatchResult }	-- What to do after match
-
--- The semantics of (match vs (EqnInfo wrap pats rhs)) is the MatchResult
---	\fail. wrap (case vs of { pats -> rhs fail })
--- where vs are not in the domain of wrap
-
 firstPat :: EquationInfo -> Pat Id
 firstPat eqn = head (eqn_pats eqn)
 
@@ -208,23 +200,6 @@ shiftPats (ConPatOut _ _ _ _ (PrefixCon arg_pats) _ : pats) = map unLoc arg_pats
 shiftPats (pat_with_no_sub_pats			    : pats) = pats
 \end{code}
 
-
-\begin{code}
--- A MatchResult is an expression with a hole in it
-data MatchResult
-  = MatchResult
-	CanItFail	-- Tells whether the failure expression is used
-	(CoreExpr -> DsM CoreExpr)
-			-- Takes a expression to plug in at the
-			-- failure point(s). The expression should
-			-- be duplicatable!
-
-data CanItFail = CanFail | CantFail
-
-orFail CantFail CantFail = CantFail
-orFail _        _	 = CanFail
-\end{code}
-
 Functions on MatchResults
 
 \begin{code}

ghc/compiler/deSugar/Match.hi-boot-6

@@ -2,8 +2,8 @@ module Match where
 
 match 	:: [Var.Id]
         -> TcType.TcType
-	-> [DsUtils.EquationInfo]
-	-> DsMonad.DsM DsUtils.MatchResult
+	-> [DsMonad.EquationInfo]
+	-> DsMonad.DsM DsMonad.MatchResult
 
 matchWrapper
 	:: HsExpr.HsMatchContext Name.Name
@@ -23,5 +23,5 @@ matchSinglePat
 	-> DsMonad.DsMatchContext
 	-> HsPat.LPat Var.Id
         -> TcType.TcType
-	-> DsUtils.MatchResult
-	-> DsMonad.DsM DsUtils.MatchResult
+	-> DsMonad.MatchResult
+	-> DsMonad.DsM DsMonad.MatchResult

ghc/compiler/deSugar/Match.lhs-boot

+\begin{code}
+module Match where
+import Var	( Id )
+import TcType	( TcType )
+import DsMonad	( DsM, DsMatchContext, EquationInfo, MatchResult )
+import CoreSyn	( CoreExpr )
+import HsSyn	( LPat, HsMatchContext, MatchGroup )
+import Name	( Name )
+
+match 	:: [Id]
+        -> TcType
+	-> [EquationInfo]
+	-> DsM MatchResult
+
+matchWrapper
+	:: HsMatchContext Name
+        -> MatchGroup Id
+	-> DsM ([Id], CoreExpr)
+
+matchSimply
+	:: CoreExpr
+	-> HsMatchContext Name
+	-> LPat Id
+	-> CoreExpr
+	-> CoreExpr
+	-> DsM CoreExpr
+
+matchSinglePat
+	:: CoreExpr
+	-> DsMatchContext
+	-> LPat Id
+        -> TcType
+	-> MatchResult
+	-> DsM MatchResult
+\end{code}

ghc/compiler/ghci/Linker.lhs

@@ -124,7 +124,6 @@ emptyPLS dflags = PersistentLinkerState {
   where init_pkgs
 	  | ExtPackage rts_id <- rtsPackageId (pkgState dflags) = [rts_id]
 	  | otherwise = []
-
 \end{code}
 
 \begin{code}

ghc/compiler/hsSyn/HsBinds.lhs

@@ -242,16 +242,20 @@ sigName (L _ sig) = f sig
     f (FixSig (FixitySig n _)) = Just (unLoc n)
     f other			= Nothing
 
-isFixitySig :: Sig name -> Bool
-isFixitySig (FixSig _) = True
-isFixitySig _	       = False
+isFixityLSig :: LSig name -> Bool
+isFixityLSig (L _ (FixSig _)) = True
+isFixityLSig _	              = False
 
-isPragSig :: Sig name -> Bool
+isVanillaLSig :: LSig name -> Bool
+isVanillaLSig (L _(Sig name _)) = True
+isVanillaLSig sig	        = False
+
+isPragLSig :: LSig name -> Bool
 	-- Identifies pragmas 
-isPragSig (SpecSig _ _)     = True
-isPragSig (InlineSig _ _ _) = True
-isPragSig (SpecInstSig _)   = True
-isPragSig other		    = False
+isPragLSig (L _ (SpecSig _ _))     = True
+isPragLSig (L _ (InlineSig _ _ _)) = True
+isPragLSig (L _ (SpecInstSig _))   = True
+isPragLSig other		   = False
 
 hsSigDoc (Sig        _ _) 	  = ptext SLIT("type signature")
 hsSigDoc (SpecSig    _ _) 	  = ptext SLIT("SPECIALISE pragma")

ghc/compiler/hsSyn/HsExpr.lhs-boot

+\begin{code}
+module HsExpr where
+
+import SrcLoc	  ( Located )
+import Outputable ( SDoc, OutputableBndr )
+import {-# SOURCE #-} HsPat  ( LPat )
+	
+data HsExpr i
+data HsSplice i
+data MatchGroup a
+data GRHSs a
+
+type LHsExpr a = Located (HsExpr a)
+
+pprExpr :: (OutputableBndr i) => 
+	HsExpr i -> SDoc
+
+pprSplice :: (OutputableBndr i) => 
+	HsSplice i -> SDoc
+
+pprPatBind :: (OutputableBndr b, OutputableBndr i) => 
+	LPat b -> GRHSs i -> SDoc
+
+pprFunBind :: (OutputableBndr i) => 
+	i -> MatchGroup i -> SDoc
+\end{code}

ghc/compiler/hsSyn/HsPat.lhs-boot

+\begin{code}
+module HsPat where
+import SrcLoc( Located )
+
+data Pat i
+type LPat i = Located (Pat i)
+\end{code}

ghc/compiler/iface/BinIface.hs

@@ -94,6 +94,7 @@ readBinIface hi_path = getBinFileWithDict hi_path
 instance Binary ModIface where
    put_ bh (ModIface {
 		 mi_module    = mod,
+		 mi_boot      = is_boot,
 		 mi_mod_vers  = mod_vers,
 		 mi_package   = _, -- we ignore the package on output
 		 mi_orphan    = orphan,
@@ -111,6 +112,7 @@ instance Binary ModIface where
 	build_tag <- readIORef v_Build_tag
 	put  bh build_tag
 	put_ bh mod
+	put_ bh is_boot
 	put_ bh mod_vers
 	put_ bh orphan
 	lazyPut bh deps
@@ -145,7 +147,7 @@ instance Binary ModIface where
 		++ build_tag ++ ", found " ++ check_way))
 
 	mod_name  <- get bh
-
+	is_boot   <- get bh
 	mod_vers  <- get bh
 	orphan    <- get bh
 	deps	  <- lazyGet bh
@@ -161,8 +163,8 @@ instance Binary ModIface where
 	return (ModIface {
 		 mi_package   = HomePackage, -- to be filled in properly later
 		 mi_module    = mod_name,
+		 mi_boot      = is_boot,
 		 mi_mod_vers  = mod_vers,
-		 mi_boot      = False,		-- Binary interfaces are never .hi-boot files!
 		 mi_orphan    = orphan,
 		 mi_deps      = deps,
 		 mi_usages    = usages,

ghc/compiler/iface/IfaceType.lhs

@@ -9,7 +9,7 @@ module IfaceType (
 	IfaceType(..), IfaceKind, IfacePredType(..), IfaceTyCon(..),
 	IfaceContext, IfaceBndr(..), IfaceTvBndr, IfaceIdBndr,
 
-	IfaceExtName(..), mkIfaceExtName, ifaceTyConName, 
+	IfaceExtName(..), mkIfaceExtName, ifaceTyConName, ifPrintUnqual,
 
 	-- Conversion from Type -> IfaceType
 	toIfaceType, toIfacePred, toIfaceContext, 
@@ -65,6 +65,11 @@ data IfaceExtName
 
 mkIfaceExtName name = ExtPkg (nameModule name) (nameOccName name)
 	-- Local helper for wired-in names
+
+ifPrintUnqual :: PrintUnqualified -> IfaceExtName -> Bool
+ifPrintUnqual print_unqual (ExtPkg  mod occ)   = print_unqual mod occ
+ifPrintUnqual print_unqual (HomePkg mod occ _) = print_unqual mod occ
+ifPrintUnqual print_unqual other	       = True
 \end{code}
 
 

ghc/compiler/iface/LoadIface.lhs

@@ -9,8 +9,7 @@ module LoadIface (
 	loadSrcInterface, loadOrphanModules, loadHiBootInterface,
 	readIface,	-- Used when reading the module's old interface
 	predInstGates, ifaceInstGates, ifaceStats, discardDeclPrags,
-	initExternalPackageState,
-	noIfaceErr,   -- used by CompManager too
+	initExternalPackageState
    ) where
 
 #include "HsVersions.h"
@@ -19,10 +18,7 @@ import {-# SOURCE #-}	TcIface( tcIfaceDecl )
 
 import Packages		( PackageState(..), PackageIdH(..), isHomePackage )
 import DriverState	( v_GhcMode, isCompManagerMode )
-import DriverUtil	( replaceFilenameSuffix )
 import CmdLineOpts	( DynFlags(..), DynFlag( Opt_IgnoreInterfacePragmas ) )
-import Parser		( parseIface )
-
 import IfaceSyn		( IfaceDecl(..), IfaceConDecl(..), IfaceClassOp(..),
 			  IfaceConDecls(..), IfaceInst(..), IfaceRule(..),
 			  IfaceExpr(..), IfaceTyCon(..), IfaceIdInfo(..), 
@@ -55,28 +51,24 @@ import Name		( Name {-instance NamedThing-}, getOccName,
 import NameEnv
 import MkId		( seqId )
 import Module		( Module, ModLocation(ml_hi_file), emptyModuleEnv, 
+			  addBootSuffix_maybe,
 			  extendModuleEnv, lookupModuleEnv, moduleUserString
 			)
 import OccName		( OccName, mkOccEnv, lookupOccEnv, mkClassTyConOcc, mkClassDataConOcc,
 			  mkSuperDictSelOcc, mkDataConWrapperOcc, mkDataConWorkerOcc )
 import Class		( Class, className )
 import TyCon		( tyConName )
-import SrcLoc		( mkSrcLoc, importedSrcLoc )
+import SrcLoc		( importedSrcLoc )
 import Maybes		( mapCatMaybes, MaybeErr(..) )
-import StringBuffer     ( hGetStringBuffer )
 import FastString	( mkFastString )
-import ErrUtils         ( Message, mkLocMessage )
-import Finder		( findModule, findPackageModule,  FindResult(..),
-			  hiBootFilePath )
-import Lexer
+import ErrUtils         ( Message )
+import Finder		( findModule, findPackageModule,  FindResult(..), cantFindError )
 import Outputable
 import BinIface		( readBinIface )
 import Panic		( ghcError, tryMost, showException, GhcException(..) )
 import List		( nub )
 
 import DATA_IOREF	( readIORef )
-
-import Directory
 \end{code}
 
 
@@ -576,7 +568,7 @@ findAndReadIface explicit doc_str mod_name hi_boot_file
 	      Failed err -> do
 		{ traceIf (ptext SLIT("...not found"))
 		; dflags <- getDOpts
-		; returnM (Failed (noIfaceErr dflags mod_name err)) } ;
+		; returnM (Failed (cantFindError dflags mod_name err)) } ;
 
 	      Succeeded (file_path, pkg) -> do