1. javascript operator: spread syntax (...)

2. javascript operator: spread syntax (...): spread in array literals

3. javascript operator: spread syntax (...): spread in function calls

4. javascript operator: spread syntax (...): spread in object literals

5. regular_expressions: capturing group: `(...)`

6. regular_expressions: character class: `[...]`, `[^...]`

7. regular_expressions: character escape: `\n`, `\x`: unicode character escape: `\u{...}`

8. regular_expressions: lookahead assertion: `(?=...)`, `(?!...)`

9. regular_expressions: lookbehind assertion: `(?<=...)`, `(?<!...)`

10. regular_expressions: modifier: `(?ims-ims:...)`

11. regular_expressions: named capture group: `(?<name>...)`

12. regular_expressions: named capture group: `(?<name>...)`: duplicate names in different disjunction alternatives are allowed

13. regular_expressions: non-capturing group: `(?:...)`

14. regular_expressions: unicode character class escape: `\p{...}`, `\p{...}`

15. javascript statement: `do...while`

16. javascript statement: `for await...of`

17. javascript statement: `for...in`

18. javascript statement: `for...of`

19. javascript statement: `for...of`: closing iterators

20. javascript statement: `if...else`

21. javascript statement: `try...catch`

22. javascript statement: `try...catch`: optional catch binding

23. instructions: if...else

24. ecmascript 2019 (es10)