1. Dart
2. dart:core
3. provisional constant

##### dart:core library

1. Classes
2. BidirectionalIterator
3. BigInt
4. bool
5. Comparable
6. DateTime
7. Deprecated
8. double
9. Duration
10. Expando
11. Function
12. Future
13. int
14. Invocation
15. Iterable
16. Iterator
17. List
18. Map
19. MapEntry
20. Match
21. Null
22. num
23. Object
24. Pattern
25. pragma
26. Provisional
27. RegExp
28. RegExpMatch
29. RuneIterator
30. Runes
31. Set
32. Sink
33. StackTrace
34. Stopwatch
35. Stream
36. String
37. StringBuffer
38. StringSink
39. Symbol
40. Type
41. Uri
42. UriData
43. Constants
44. deprecated
45. override
46. provisional
47. proxy
48. Functions
49. identical
50. identityHashCode
51. print
52. Typedefs
53. Comparator
54. Exceptions
55. AbstractClassInstantiationError
56. ArgumentError
57. AssertionError
58. CastError
59. ConcurrentModificationError
60. CyclicInitializationError
61. Error
62. Exception
63. FallThroughError
64. FormatException
65. IndexError
66. IntegerDivisionByZeroException
67. LateInitializationError
68. NoSuchMethodError
69. NullThrownError
70. OutOfMemoryError
71. RangeError
72. StackOverflowError
73. StateError
74. TypeError
75. UnimplementedError
76. UnsupportedError

description

# provisional top-level constant Null safety

Null const provisional

An annotation that was used during development of Dart 2.

Should not be used any more.

## Implementation

    const Null provisional = null