Module errors

Defines Rust errors, which are not part of the spec but generated by it.

Enums

• AtomicTypeParseError
  Defines errors occuring when parsing AtomicTypes from strings.
• ExpressionVarRefParseError
  Defines errors occuring when parsing ExpressionVarRefs from strings.
• NonEmptyVecParseError
  Defines errors occurring when parsing NonEmptyVecs from strings.
• TriggerKindParseError
  Defines errors occuring when parsing TriggerKinds from strings.
• VersionParseError
  Defines errors occuring when parsing Versions from strings.
• ViolationKindParseError
  Defines errors occuring when parsing ViolationKinds from strings.