From ecb2ccfb36c2b2b9605082eb6a0b0349ecb7dcfb Mon Sep 17 00:00:00 2001
From: simonpj <unknown>
Date: Mon, 26 Feb 2001 15:41:18 +0000
Subject: [PATCH] [project @ 2001-02-26 15:41:18 by simonpj] Dont print
 generic insts if there arent any

---
 ghc/compiler/typecheck/TcInstDcls.lhs |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/ghc/compiler/typecheck/TcInstDcls.lhs b/ghc/compiler/typecheck/TcInstDcls.lhs
index fd70cff..53e30cc 100644
--- a/ghc/compiler/typecheck/TcInstDcls.lhs
+++ b/ghc/compiler/typecheck/TcInstDcls.lhs
@@ -312,6 +312,9 @@ getGenericInstances class_decls
     let
 	gen_inst_info = concat gen_inst_infos
     in
+    if null gen_inst_info then
+	returnTc []
+    else
     getDOptsTc						`thenTc`  \ dflags ->
     ioToTc (dumpIfSet_dyn dflags Opt_D_dump_deriv "Generic instances" 
 		      (vcat (map pprInstInfo gen_inst_info)))	
-- 
1.7.10.4