217     pub fn is_empty(&self) -> bool {  in is_empty()  method
220             Self::IntegerRange(constraint) => constraint.is_empty(),  in is_empty()
221             Self::FloatRange(constraint) => constraint.is_empty(),  in is_empty()
222             Self::Bool(constraint) => constraint.is_empty(),  in is_empty()
223             Self::StringSequence(constraint) => constraint.is_empty(),  in is_empty()
224             Self::String(constraint) => constraint.is_empty(),  in is_empty()
379     pub fn is_empty(&self) -> bool {  in is_empty()  method
382             Self::IntegerRange(constraint) => constraint.is_empty(),  in is_empty()
383             Self::FloatRange(constraint) => constraint.is_empty(),  in is_empty()
384             Self::Bool(constraint) => constraint.is_empty(),  in is_empty()
385             Self::StringSequence(constraint) => constraint.is_empty(),  in is_empty()
386             Self::String(constraint) => constraint.is_empty(),  in is_empty()
419         if self.is_empty() {  in into_sanitized()
472         let actual = subject.is_empty();  in default()
583     fn is_empty() {  in is_empty()  function
586         assert!(empty_subject.is_empty());  in is_empty()
597             assert!(!non_empty_subject.is_empty());  in is_empty()