Specify line and file of the error

[L3nn0x]

Right now the error printed doesn't include nor the line nor the file.
It would be good to add it, as well as the column if possible.

[L3nn0x]

Bumping up the issue as I get Error: Error { kind: UnknownLabel("J"), state: State { next_error: None, backtrace: None } } which doesn't help at all.