Hi (and hello everybody), I read the FAQ, I searched down till Nov 2008, but did not find anything. I hope I didn't miss a FAQ or somewhat. (If so, please apologize!) My (freshly installed) GHCi 6.10.1 runs on Windows XP on Intel Dual Core. I used the .msi of the Webpage some two weeks ago. I got some strange program as example and tried out - and my ghci died quitly without any helping message. Here is the original programm: | f x y z = a + b*c + b + fun c | where a = x * y + z | b = c * fun x | c = a * b | fun x = x * x + 1 For testing out in previous of this posting, the following is the very same and had the same problem: | let f x y z = a + b*c + b + fun c where {a = x * y + z; b = c * fun x; c = a * b; fun x = x * x + 1} The query to die was "f 1 2 3". I tried with verbose ghci: | C:\...\ghc-6.10.1\bin>ghci -v | GHCi, version 6.10.1: http://www.haskell.org/ghc/ :? for help | Glasgow Haskell Compiler, Version 6.10.1, for Haskell 98, stage 2 booted by GHC | version 6.8.3 | Using package config file: C:\...\GHC-61~1.1\package.conf | hiding package base-3.0.3.0 to avoid conflict with later version base-4.0.0.0 | wired-in package ghc-prim mapped to ghc-prim-0.1.0.0 | wired-in package integer mapped to integer-0.1.0.0 | wired-in package base mapped to base-4.0.0.0 | wired-in package rts mapped to rts-1.0 | wired-in package haskell98 mapped to haskell98-1.0.1.0 | wired-in package syb mapped to syb-0.1.0.0 | wired-in package template-haskell mapped to template-haskell-2.3.0.0 | wired-in package dph-seq mapped to dph-seq-0.3 | wired-in package dph-par mapped to dph-par-0.3 | Hsc static flags: -static | Loading package ghc-prim ... linking ... done. | Loading package integer ... linking ... done. | Loading package base ... linking ... done. | Prelude> let f x y z = a + b*c + b + fun c where {a = x * y + z; b = c * fun x; | c = a * b; fun x = x * x + 1} | *** Parser: | *** Desugar: | *** Simplify: | *** CorePrep: | *** ByteCodeGen: | Prelude> f 1 2 3 | *** Parser: | *** Desugar: | *** Simplify: | *** CorePrep: | *** ByteCodeGen: | | C:\...\ghc-6.10.1\bin> I hope I could help finding some strange bug, killing 99% of your problems with Haskell, life and love, although I am very sure this one is only minor... ;-) MFG (With friendly regards) -- Heiko Studt <studt@fmi.uni-passau.de>