Add bang patterns

[ghc-hetmet.git] / ghc / compiler / deSugar / Check.lhs

diff --git a/ghc/compiler/deSugar/Check.lhs b/ghc/compiler/deSugar/Check.lhs
index 693368b..9aac5ce 100644 (file)
--- a/ghc/compiler/deSugar/Check.lhs
+++ b/ghc/compiler/deSugar/Check.lhs
@@ -611,7 +611,8 @@ has_nplusk_pat (ConPatOut _ _ _ _ ps ty) = any has_nplusk_lpat (hsConArgs ps)
 has_nplusk_pat (ListPat ps _)                   = any has_nplusk_lpat ps
 has_nplusk_pat (TuplePat ps _ _)        = any has_nplusk_lpat ps
 has_nplusk_pat (PArrPat ps _)                   = any has_nplusk_lpat ps
-has_nplusk_pat (LazyPat p)                      = False
+has_nplusk_pat (LazyPat p)                      = False        -- Why?
+has_nplusk_pat (BangPat p)                      = has_nplusk_lpat p    -- I think
 has_nplusk_pat p = False       -- VarPat, VarPatOut, WildPat, LitPat, NPat, TypePat, DictPat
 
 simplify_lpat :: LPat Id -> LPat Id  
@@ -623,6 +624,7 @@ simplify_pat (VarPat id)      = WildPat (idType id)
 simplify_pat (VarPatOut id _) = WildPat (idType id)    -- Ignore the bindings
 simplify_pat (ParPat p)       = unLoc (simplify_lpat p)
 simplify_pat (LazyPat p)      = unLoc (simplify_lpat p)
+simplify_pat (BangPat p)      = unLoc (simplify_lpat p)
 simplify_pat (AsPat id p)     = unLoc (simplify_lpat p)
 simplify_pat (SigPatOut p _)  = unLoc (simplify_lpat p)        -- I'm not sure this is right