On 09 February 2005 13:32, Peter Simons wrote:
I have an interesting problem. There are two versions of the HsDNS package installed right now:
$ ghc-pkg list | /usr/local/ghc-current/lib/ghc-6.5/package.conf: | rts-1.0, [...] (hsdns-2005-02-04), | hsdns-2005-02-08
Now how can I unregister them? I have tried everything I could think of, but no luck:
$ ghc-pkg unregister hsdns | ghc-pkg: package hsdns matches multiple packages: | hsdns-2005-02-04, hsdns-2005-02-08
$ ghc-pkg unregister hsdns-2005-02-08 | ghc-pkg: cannot parse 'hsdns-2005-02-08' as a package identifier
Can someone give me a pointer how to remedy this situation?
The problem is not really that "hsdns-2005-02-08" isn't a legal package identifier, actually it is an ambiguous package identifier. I suggest you remove that package by hand from the package.conf file, and instead use "hsdns-2005.02.08". The general syntax of package ids is: pkgid ::= pkg ('-' version)? pkg ::= (alphanum|'-')+ version ::= (digit+) ('.' digit+)* ('-' alphanum+)* This syntax means that package ids which have numeric component(s) at the end and no '.' will be ambiguous. I've added a test to ghc-pkg to prevent you from registering a package with a problematic package id for now. Perhaps we should change the syntax of package ids though? Cheers, Simon