View patterns, record wildcards, and record puns

[ghc-hetmet.git] / compiler / parser / RdrHsSyn.lhs

diff --git a/compiler/parser/RdrHsSyn.lhs b/compiler/parser/RdrHsSyn.lhs
index b6d3446..6e77dee 100644 (file)
--- a/compiler/parser/RdrHsSyn.lhs
+++ b/compiler/parser/RdrHsSyn.lhs
@@ -4,6 +4,13 @@
 Functions over HsSyn specialised to RdrName.
 
 \begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
 module RdrHsSyn (
        extractHsTyRdrTyVars, 
        extractHsRhoRdrTyVars, extractGenericPatTyVars,
@@ -646,7 +653,7 @@ checkAPat loc e = case e of
    -- Overloaded numeric patterns (e.g. f 0 x = x)
    -- Negation is recorded separately, so that the literal is zero or +ve
    -- NB. Negative *primitive* literals are already handled by the lexer
-   HsOverLit pos_lit            -> return (mkNPat pos_lit Nothing)
+   HsOverLit pos_lit          -> return (mkNPat pos_lit Nothing)
    NegApp (L _ (HsOverLit pos_lit)) _ 
                        -> return (mkNPat pos_lit (Just noSyntaxExpr))
    
@@ -658,6 +665,8 @@ checkAPat loc e = case e of
 
    ELazyPat e        -> checkLPat e >>= (return . LazyPat)
    EAsPat n e        -> checkLPat e >>= (return . AsPat n)
+   -- view pattern is well-formed if the pattern is
+   EViewPat expr patE -> checkLPat patE >>= (return . (\p -> ViewPat expr p placeHolderType))
    ExprWithTySig e t  -> checkLPat e >>= \e ->
                         -- Pattern signatures are parsed as sigtypes,
                         -- but they aren't explicit forall points.  Hence
@@ -670,7 +679,7 @@ checkAPat loc e = case e of
    
    -- n+k patterns
    OpApp (L nloc (HsVar n)) (L _ (HsVar plus)) _ 
-       (L _ (HsOverLit lit@(HsIntegral _ _)))
+       (L _ (HsOverLit lit@(HsIntegral _ _ _)))
                      | plus == plus_RDR
                      -> return (mkNPlusKPat (L nloc n) lit)