From 98a1ebecb6d22d793b1d9f8e1d24ecbb5a2d130f Mon Sep 17 00:00:00 2001
From: simonm <unknown>
Date: Mon, 2 Feb 1998 16:47:53 +0000
Subject: [PATCH] [project @ 1998-02-02 16:47:53 by simonm] Short-cut unary
 '-' applied to an integer constant, before literal
 overloading kicks in.

---
 ghc/compiler/typecheck/TcExpr.lhs |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ghc/compiler/typecheck/TcExpr.lhs b/ghc/compiler/typecheck/TcExpr.lhs
index 34bb8cc..38a124e 100644
--- a/ghc/compiler/typecheck/TcExpr.lhs
+++ b/ghc/compiler/typecheck/TcExpr.lhs
@@ -185,7 +185,15 @@ tcExpr (HsLit lit@(HsString str)) res_ty
 tcExpr (HsPar expr) res_ty -- preserve parens so printing needn't guess where they go
   = tcExpr expr res_ty
 
-tcExpr (NegApp expr neg) res_ty = tcExpr (HsApp neg expr) res_ty
+-- perform the negate *before* overloading the integer, since the case
+-- of minBound on Ints fails otherwise.  Could be done elsewhere, but
+-- convenient to do it here.
+
+tcExpr (NegApp (HsLit (HsInt i)) neg) res_ty
+  = tcExpr (HsLit (HsInt (-i))) res_ty
+
+tcExpr (NegApp expr neg) res_ty 
+  = tcExpr (HsApp neg expr) res_ty
 
 tcExpr (HsLam match) res_ty
   = tcMatchExpected [] res_ty match	`thenTc` \ (match',lie) ->
-- 
1.7.10.4