// checkForUndefinedReferences seeks to confirm that all identifiers encountered have been marked as known (being declared)
func (this Form) checkForUndefinedReferences(typeChecker interfaces.TypeChecker) {
for identifier, identifierKnown := range typeChecker.KnownIdentifiers() {
if !identifierKnown {
typeChecker.AddEncounteredError(errors.NewUndefinedQuestionReferenceError(identifier))
}
}
}
// checkForCyclicDependencies checks if the this question depends on itself, and if so, adds an error to the typechecker
func checkForCyclicDependencies(question interfaces.Question, typeChecker interfaces.TypeChecker) {
// if we find our own VarID as a dependency at least once, the dependencyChain is cyclic
if typeChecker.DependencyListForVarDeclContainsReferenceToSelf(question.VarDecl()) {
typeChecker.AddEncounteredError(errors.NewCyclicDependencyError(question.VarDecl()))
}
}