pub struct FatalError;
This structure is used to signify that a task has failed with a fatal error
from the diagnostics. You can use this with the Any trait to figure out
how a rustc task died (if so desired).
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).