Error Tests

[Mercerenies]

This isn't exactly an issue, per se, but it is a testing lapse.

Going somewhat off of #45, I would like to have at least one test case for every type of error that can be produced by the system. Some errors, such as ModifierError types, are pretty well represented, all things considered, but several of the more obscure errors do not appear at all in test cases.

• [ ] ParseError
• [ ] IOError
• [ ] DottedListError
• [ ] ArgListParseErrorF::InvalidArgument
• [ ] ArgListParseErrorF::BadSelf
• [ ] ArgListParseErrorF::UnknownDirective
• [ ] ArgListParseErrorF::DirectiveOutOfOrder
• [ ] ArgListParseErrorF::SimpleArgListExpected
• [ ] ArgListParseErrorF::SimpleArgExpected
• [ ] ArgListParseErrorF::ConstructorArgListExpected
• [ ] ImportDeclParseError::NoFilename
• [ ] ImportDeclParseError::BadFilename
• [ ] ImportDeclParseError::InvalidPath
• [ ] ImportDeclParseError::MalformedFunctionImport
• [ ] ImportDeclParseError::InvalidEnding
• [x] CannotCall
• [ ] WrongNumberArgs
• [ ] InvalidArg
• [ ] NoSuchVar
• [ ] NoSuchFn
• [x] NoSuchEnumValue
• [x] NoSuchMagic - Internal-only error
• [ ] UnknownDecl
• [ ] UnquoteOutsideQuasiquote
• [ ] UnquoteSplicedOutsideQuasiquote
• [ ] BadUnquoteSpliced
• [ ] NoSuchFile
• [x] AmbiguousNamespace
• [x] NotConstantEnough
• [x] CannotAssignTo
• [x] CannotExtend
• [x] ExportOnInnerClassVar
• [ ] InvalidImportOnResource
• [ ] GodotServerError
• [x] StaticConstructor
• [x] StaticOnLambdaClass
• [x] ModifierParseErrorF::UniquenessError
• [ ] ModifierParseErrorF::Expecting
• [ ] ModifierParseErrorF::ExhaustedAlternatives
• [x] MacroInMinimalistError - Internal-only error
• [x] MacroBeforeDefinitionError
• [x] DuplicateMainClass
• [x] ContextualFilenameUnresolved - Internal-only error
• [x] DuplicateConstructor
• [x] DuplicateName
• [x] BadGetterArguments
• [x] BadSetterArguments
• [x] FieldAccessorConflict
• [x] BadSuperCall
• [ ] BadExtendsClause
• [ ] BadEnumClause
• [x] BadSysDeclare
• [ ] UnknownImportedName
• [x] DuplicateNameConflictInMainClass
• [ ] BadPreloadArgument
• [ ] BadBootstrappingDirective - Internal-only error
• [ ] LoopPrimitiveError (both break and continue)
• [x] ExprAtTopLevel
• [x] MinimalistAtRepl
• [ ] CyclicImport
• [x] NullargsConstructor

[Mercerenies]

Added a list of all error types. They will be checked off once they have satisfactory test coverage.

[Mercerenies]

Removing NonFunctionMarkedAsBuiltin, as we reverted that commit and went a different way. That error no longer exists.