Why is addError method on ClassCodeVisitorSupport and not parent CodeVisitorSupport?

Why is addError method on ClassCodeVisitorSupport and not parent
CodeVisitorSupport?

ClassCodeVisitorSupport is a subtype of CodeVisitorSupport.
ClassCodeVisitorSupport defines addError, which is useful to add
errors to the SourceUnit.

Is there any reason this isn't pulled up into CodeVisitorSupport,
beyond that it would then require that class to hold a reference to
SourceUnit?

--
Hamlet D'Arcy
hamletdrc@...

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