Hi
Just a wild guess but maybe the interpreter is recompiling (in
runtime) code that has already been compiled to build your application
(in compile-time). This may lead to inconsistencies since a type such
as HackMail.Data.Main.Types.Filter may refer to two different (and
incompatible) types.
To see if this is the case, make sure your "dynamic" code is not
located together with your base code (i.e., move it to another
directory, and set the src file directory for the interpreter
accordingly). Now you may get another runtime error, something along
the lines of "Module not found: HackMail.Data.MainTypes". This
basically means that you need to make your (already compiled) types
available to the interpreter. I think the simplest way is to put all
your support types in a package, register it with ghc, link your
application to it, and ask the interpreter to use this package (with a
"-package " flag).
Hope this helps!
Daniel
On Mar 17, 2009, at 11:52 PM, Joe Fredette wrote:
List,
I've got this project, source on patch-tag here[1]
It's a nice little project, I've got the whole thing roughly
working, it compiles okay, everything seems to work, until I try to
run it, specifically when I run it in ghci, or when I run the main
executable (which uses hint), and look at any type involving my
"Email" type, it gives me the following error:
Type syonym HackMail.Data.MainTypes.Filter:
Can't find interface-file declaration for type constructor or
class HackMail.Data.ParseEmail.Email
Probable cause: bug in .hi-boot file, or inconsistent .hi file
Use -ddump-if-trace to get an idea of which file caused the error
As far as I understand, it wants to find the interface-file
declaration for a specific type (Email) exported by the ParseEmail
module, all of the exports (I think) are in order. I've tried
mucking around with it a bit, but I don't fully understand what the
error even means, much less how to fix it.
Other relevant info, Email is exported in a roundabout way, namely
by importing a module MainTypes, which exports a module Email, which
exports a the ParseEmail Module, which exports the datatype Email.
The "Filter" delcaration it _actually_ complains about (it's just
the first place the email type is invoked) is:
type Filter a = ReaderT (Config, Email) IO a
nothing particularly special.
Any help fixing this is greatly appreciated, I did find this bug
report[2] which seems like it might be relevant.
But trying to unregister -> cabal clean -> cabal install doesn't fix
it. I've also tried manually removing the dist/ folder, and also
unregistering the package.
Thanks again.
/Joe
[1] http://patch-tag.com/repo/Hackmail/browse
[2] http://hackage.haskell.org/trac/ghc/ticket/2057
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