non_constant_annotation_constructor

Annotation creation can only call a const constructor.

The analyzer produces this diagnostic when an annotation is the invocation of an existing constructor even though the invoked constructor isn't a const constructor.

The following code produces this diagnostic because the constructor for C isn't a const constructor:

@C()
void f() {
}

class C {
  C();
}

If it's valid for the class to have a const constructor, then create a const constructor that can be used for the annotation:

@C()
void f() {
}

class C {
  const C();
}

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