const_spread_expected_list_or_set
A list or a set is expected in this spread.
Description
#The analyzer produces this diagnostic when the expression of a spread operator in a constant list or set evaluates to something other than a list or a set.
Example
#The following code produces this diagnostic because the value of list1
is null
, which is neither a list nor a set:
dart
const dynamic list1 = 42;
const List<int> list2 = [...list1];
Common fixes
#Change the expression to something that evaluates to either a constant list or a constant set:
dart
const dynamic list1 = [42];
const List<int> list2 = [...list1];
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Provide details 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.