Comments only

diff --git a/compiler/parser/RdrHsSyn.lhs b/compiler/parser/RdrHsSyn.lhs
index 0cfa292..221e4c2 100644 (file)
--- a/compiler/parser/RdrHsSyn.lhs
+++ b/compiler/parser/RdrHsSyn.lhs
@@ -797,7 +797,7 @@ mk_gadt_con name qvars cxt ty
        -- The parser left-associates, so there should 
        -- not be any OpApps inside the e's
 splitBang :: LHsExpr RdrName -> Maybe (LHsExpr RdrName, [LHsExpr RdrName])
--- Splits (f ! g a b) into (f, [(! g), a, g])
+-- Splits (f ! g a b) into (f, [(! g), a, b])
 splitBang (L loc (OpApp l_arg bang@(L loc' (HsVar op)) _ r_arg))
   | op == bang_RDR = Just (l_arg, L loc (SectionR bang arg1) : argns)
   where
@@ -809,6 +809,16 @@ splitBang other = Nothing
 isFunLhs :: LHsExpr RdrName 
         -> P (Maybe (Located RdrName, Bool, [LHsExpr RdrName]))
 -- Just (fun, is_infix, arg_pats) if e is a function LHS
+--
+-- The whole LHS is parsed as a single expression.  
+-- Any infix operators on the LHS will parse left-associatively
+-- E.g.        f !x y !z
+--     will parse (rather strangely) as 
+--             (f ! x y) ! z
+--     It's up to isFunLhs to sort out the mess
+--
+-- a .!. !b 
+
 isFunLhs e = go e []
  where
    go (L loc (HsVar f)) es