[reactive] Version conflicts despite hiding

[Thomas Davie]

On 17 Dec 2008, at 17:51, Patai Gergely wrote:

> Hello all,
>
> I have a little problem I haven't run into yet. I'm not sure if it's
> Reactive related, but that's what caused it for me, so I'm writing  
> here.
> I managed to run Tetris.hs with reactive-0.10.3 and reactive- 
> glut-0.1.4
> with success (also observing the problems mentioned by Claus Reinke).
> Now I ran an update, and ghc -v says the following as expected:
>
> hiding package reactive-0.10.3 to avoid conflict with later version
> reactive-0.10.5
> hiding package reactive-glut-0.1.4 to avoid conflict with later  
> version
> reactive-glut-0.1.6
>
> However, when I try to compile Tetris or load it into ghci, it says  
> that
> it can't match 'UI' (expected) with
> 'reactive-glut-0.1.4:FRP.Reactive.GLUT.UI.UI' (inferred) in dropPiece,
> and I've no idea where it is getting the latter from. There are no
> leftover .hi files or anything else in reach. Is reactive-fieldtrip a
> possible culprit?

That sounds like you've recompiled reactive-glut, but not reactive- 
fieldtrip afterwards (which depends on reactive glut).  The result  
being that reactive-fieldtrip was type checked against an earlier  
version of reactive-glut than Tetris is being.

Bob