X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fparser%2FLexer.x;h=11810a60601ce2b3fadc92709f5014d2a46a435a;hp=e008456e7a4f7f0af5299039f9d94392be63a4e6;hb=c71662b207222b409ac678b5e6c55d0fec8df2b7;hpb=922de8ca1aa3f2a1796e8cfa9bf8e52d7b959d9b

diff --git a/compiler/parser/Lexer.x b/compiler/parser/Lexer.x
index e008456..11810a6 100644
--- a/compiler/parser/Lexer.x
+++ b/compiler/parser/Lexer.x
@@ -614,7 +614,7 @@ reservedWordsFM = listToUFM $
 	( "_scc_",	ITscc, 		0 ),		-- ToDo: remove
 
       	( "forall",	ITforall,	 bit tvBit),
-	( "mdo",	ITmdo,		 bit glaExtsBit),
+	( "mdo",	ITmdo,		 bit recursiveDoBit),
 	( "family",	ITfamily,	 bit tyFamBit),
 
 	( "foreign",	ITforeign,	 bit ffiBit),
@@ -1518,7 +1518,8 @@ bangPatBit = 8	-- Tells the parser to understand bang-patterns
 tyFamBit   = 9	-- indexed type families: 'family' keyword and kind sigs
 haddockBit = 10 -- Lex and parse Haddock comments
 magicHashBit = 11 -- # in both functions and operators
-kindSigsBit = 12 -- # in both functions and operators
+kindSigsBit = 12 -- Kind signatures on type variables
+recursiveDoBit = 13 -- mdo
 
 glaExtsEnabled, ffiEnabled, parrEnabled :: Int -> Bool
 glaExtsEnabled   flags = testBit flags glaExtsBit
@@ -1533,6 +1534,7 @@ tyFamEnabled     flags = testBit flags tyFamBit
 haddockEnabled   flags = testBit flags haddockBit
 magicHashEnabled flags = testBit flags magicHashBit
 kindSigsEnabled  flags = testBit flags kindSigsBit
+recursiveDoEnabled flags = testBit flags recursiveDoBit
 
 -- PState for parsing options pragmas
 --
@@ -1586,6 +1588,7 @@ mkPState buf loc flags  =
 	       .|. haddockBit   `setBitIf` dopt Opt_Haddock      flags
 	       .|. magicHashBit `setBitIf` dopt Opt_MagicHash    flags
 	       .|. kindSigsBit  `setBitIf` dopt Opt_KindSignatures flags
+	       .|. recursiveDoBit `setBitIf` dopt Opt_RecursiveDo flags
       --
       setBitIf :: Int -> Bool -> Int
       b `setBitIf` cond | cond      = bit b