From: simonpj@microsoft.com <unknown>
Date: Mon, 4 Sep 2006 13:14:12 +0000 (+0000)
Subject: Enable bang-patterns only when the flag says so (had missed a case before)
X-Git-Tag: Before_FC_branch_merge~75
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=56dfaffd65d96d27a74c906c2201fd392e06f154

Enable bang-patterns only when the flag says so (had missed a case before)
---

diff --git a/compiler/parser/RdrHsSyn.lhs b/compiler/parser/RdrHsSyn.lhs
index cd82da1..2e846a5 100644
--- a/compiler/parser/RdrHsSyn.lhs
+++ b/compiler/parser/RdrHsSyn.lhs
@@ -530,8 +530,12 @@ checkAPat loc e = case e of
    NegApp (L _ (HsOverLit pos_lit)) _ 
 			-> return (mkNPat pos_lit (Just noSyntaxExpr))
    
-   SectionR (L _ (HsVar bang)) e 
- 	| bang == bang_RDR -> checkLPat e >>= (return . BangPat)
+   SectionR (L _ (HsVar bang)) e 	-- (! x)
+ 	| bang == bang_RDR 
+	-> do { bang_on <- extension bangPatEnabled
+	      ; if bang_on then checkLPat e >>= (return . BangPat)
+		else parseError loc "Illegal bang-pattern (use -fbang-patterns)" }
+
    ELazyPat e	      -> checkLPat e >>= (return . LazyPat)
    EAsPat n e	      -> checkLPat e >>= (return . AsPat n)
    ExprWithTySig e t  -> checkLPat e >>= \e ->