non_const_argument_for_const_parameter
Argument '{0}' must be a constant.
Description
#The analyzer produces this diagnostic when a parameter is annotated with the mustBeConst
annotation and the corresponding argument is not a constant expression.
Example
#The following code produces this diagnostic on the invocation of the function f
because the value of the argument passed to the function g
isn't a constant:
import 'package:meta/meta.dart' show mustBeConst;
int f(int value) => g(value);
int g(@mustBeConst int value) => value + 1;
Common fixes
#If a suitable constant is available to use, then replace the argument with a constant:
import 'package:meta/meta.dart' show mustBeConst;
const v = 3;
int f() => g(v);
int g(@mustBeConst int value) => value + 1;
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.