Tunnelling information between plugin hooks

[ÉRDI Gergő]

Hi,

Is there a way to compute some value inside a plugin hook, and then make 
that available to a later hook (other than horrible hacks like writing it 
to a global `IORef` / `MVar`)?

For example, suppose my `parsedResultAction` looks at the parsed AST and 
computes a `MySourceStats` from it. How can I then access that 
`MySourceStats` value from my `typeCheckResultAction`?


Thanks,
 	Gergo