Internal error in getTypeDescAux

[Clyybber]

This doesn't compile anymore
Removing one seq field from resource fixes it.

Example

type
  Resource = ref object of RootObj
    name: string
    readers, writers: seq[RenderTask]

  RenderTask = ref object
    name: string

var res = Resource(name: "Resource 1")

(proc (r: typeof(res)) =
   echo r[])(res)

Current Output

Error: internal error: getTypeDescAux(tyGenericParam)
Traceback (most recent call last)
...

Expected Output

Compilation successfull :)

Additional Information

• It was working just a few days ago, I'm still figuring out what broke it..
• This issue is blocking my project

$ nim -v
Nim Compiler Version #devel

[Clyybber]

@timotheecour Seems like 79ec8c2 broke it.

[Clyybber]

Added showstopper because theres no way to work around it afaict.