Returns true if the reflectee is synthetic, and returns false otherwise.
A reflectee is synthetic if it is a getter or setter implicitly introduced for a field or Type, or if it is a constructor that was implicitly introduced as a default constructor or as part of a mixin application.
bool get isSynthetic;
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https://api.dart.dev/stable/2.5.0/dart-mirrors/MethodMirror/isSynthetic.html