SourceLocationMixin constructor Null safety

1. Flutter
2. source_span
3. SourceLocationMixin
4. SourceLocationMixin constructor

SourceLocationMixin class

1. Constructors
2. SourceLocationMixin
3. Properties
4. column
5. hashCode
6. line
7. offset
8. runtimeType
9. sourceUrl
10. toolString
11. Methods
12. compareTo
13. distance
14. noSuchMethod
15. pointSpan
16. toString
17. Operators
18. operator ==