use_named_constants

Use the constant '{0}' rather than a constructor returning the same object.

The analyzer produces this diagnostic when a constant is created with the same value as a known const variable.

The following code produces this diagnostic because there is a known const field (Duration.zero) whose value is the same as what the constructor invocation will evaluate to:

Duration d = const Duration(seconds: 0);

Replace the constructor invocation with a reference to the known const variable:

Duration d = Duration.zero;

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