not_iterable_spread
Spread elements in list or set literals must implement 'Iterable'.
Description
#The analyzer produces this diagnostic when the static type of the expression of a spread element that appears in either a list literal or a set literal doesn't implement the type Iterable.
Example
#The following code produces this diagnostic:
dart
var m = <String, int>{'a': 0, 'b': 1};
var s = <String>{...m};Common fixes
#The most common fix is to replace the expression with one that produces an iterable object:
dart
var m = <String, int>{'a': 0, 'b': 1};
var s = <String>{...m.keys};Unless stated otherwise, the documentation on this site reflects Dart 3.8.1. Page last updated on 2025-05-08. View source or report an issue.