From: simonpj@microsoft.com <unknown>
Date: Tue, 6 Nov 2007 10:52:58 +0000 (+0000)
Subject: Improve error messages
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=08efb089bb9a1a9c77df6caefe15b44d6ab5b2d3

Improve error messages
---

diff --git a/compiler/typecheck/TcDeriv.lhs b/compiler/typecheck/TcDeriv.lhs
index bbdd9b2..d414c6f 100644
--- a/compiler/typecheck/TcDeriv.lhs
+++ b/compiler/typecheck/TcDeriv.lhs
@@ -654,7 +654,7 @@ cond_mayDeriveDataTypeable (mayDeriveDataTypeable, _)
  | mayDeriveDataTypeable = Nothing
  | otherwise = Just why
   where
-    why  = ptext SLIT("You need -fglasgow-exts to derive an instance for this class")
+    why  = ptext SLIT("You need -XDeriveDataTypeable to derive an instance for this class")
 
 std_class_via_iso :: Class -> Bool
 std_class_via_iso clas	-- These standard classes can be derived for a newtype