GHC-problem with parsing infix type synonyms - bug?

[Johan Glimming]

> I think the syntax used in your type synonym declaration isn't 
> supported
> at the moment.  For consistency it probably should be.

Is there any chance to fix this in the next 6.4 release, or can I patch 
6.4 myself? (I'd need hints though.) I have some code in a project for 
which I want to use type synonyms for instead of data type definitions, 
to save on all the constructor names hanging around.

Johan Glimming.