non_constant_map_value

Details about the 'non_constant_map_value' diagnostic produced by the Dart analyzer.

The values in a const map literal must be constant.

The analyzer produces this diagnostic when a value in a constant map literal isn't a constant value.

The following code produces this diagnostic because a isn't a constant:

dart

var a = 'a';
var m = const {0: a};

If the map needs to be a constant map, then make the key a constant:

dart

const a = 'a';
var m = const {0: a};

If the map doesn't need to be a constant map, then remove the const keyword:

dart

var a = 'a';
var m = {0: a};

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