Returns the Diagnostic cause of this diagnostic, forming a linked chain
of diagnostics, or null if this diagnostic has no cause.
Returns the Input source to which this diagnostic is attached.
Returns the help message that describes this diagnostic.
Returns an informative comment on the source context to which this diagnostic is attached.
Returns the level of importance of this diagnostic.
Returns the annotated location Tag in the input to which this
diagnostic is attached.
Informational message attached to an input location.