RE: TH bug?

that’s strange.  It’s working with today’s build, but I don’t think I fixed anything in the last couple of days.

Could you get an up-to-date build?

S

 

-----Original Message-----
From: Reto Kramer [mailto:kramer@xxxxxxx]
Sent: 27 November 2002 21:54
To: glasgow-haskell-bugs@xxxxxxxxxxx
Subject: TH bug?

 

If tried to compile the Print.hs file below (based on the yesterday's mailing list discussion around the th printf example). I get the following error message (5.05, MAIN line, Nov 26th build), but I'm not sure if I did something really silly or if there's a genuine bug in the compiler. Can you pls have quick look at the Print.hs source below and see if you can spot the reason for the ghc crash?

 

Thanks,

- Reto

 

bash-2.05a$ lghc -fglasgow-exts -package haskell-src -i./src:./ext/HUnit-1.0 -odir./bin -hidir./bin -tmpdir./tmp -Wall -c ./src/Print.hs

ghc-5.05: panic! (the `impossible' happened, GHC version 5.05):

rename/RnExpr.lhs:164: Non-exhaustive patterns in function rnExpr

 

Please report it as a compiler bug to glasgow-haskell-bugs@xxxxxxxxxxx,

or http://sourceforge.net/projects/ghc/.

module Print(pr) where

 

import Language.Haskell.THSyntax

 

data Format = D | S | L String

 

parse :: String -> [Format]

parse s = [ L s ]

 

gen :: [Format] -> Expr

gen [D] = [| \n -> show n |]

gen [S] = [| \s -> s |]

gen [L s] = string s

 

pr :: String -> Expr

pr s = gen (parse s)