no_annotation_constructor_arguments

Annotation creation must have arguments.

The analyzer produces this diagnostic when an annotation consists of a single identifier, but that identifier is the name of a class rather than a variable. To create an instance of the class, the identifier must be followed by an argument list.

The following code produces this diagnostic because C is a class, and a class can't be used as an annotation without invoking a const constructor from the class:

class C {
  const C();
}

@C
var x;

Add the missing argument list:

class C {
  const C();
}

@C()
var x;