clone(){return new this.constructor();}
canAddDiagnostic(otherDiagnostic){return false;}
addDiagnostic(otherDiagnostic){throw new Error('Abstract virtual method: subclasses must override '+'this method if they override canAddDiagnostic');}
get guid(){if(this.guid_===undefined){this.guid_=tr.b.GUID.allocateUUID4();}
return this.guid_;}