validate problems with Arrow.hi

[Simon Marlow]

Manuel M T Chakravarty wrote:

> Everything with arrows fails as the Arrow.hi file can't be loaded; ie, I 
> get
> 
> arrowapply1.hs:8:4:
>     Can't find interface-file declaration for variable Control.Arrow.>>>
>       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
>     In the expression: proc (x, y, z) -> returnA -< x + y
>     In the definition of `f': f = proc (x, y, z) -> returnA -< x + y
> 
> This shouldn't be OS-specific, so I wonder what's happening.

It was introduced a couple of days ago with the Control.Category changes, 
I'll try to fix it today.

Cheers,
	Simon