CompileTimeErrorCode const INVALID_ANNOTATION

15 Metadata: Metadata consists of a series of annotations, each of which begin with the character @, followed by a constant expression that must be either a reference to a compile-time constant variable, or a call to a constant constructor.


static const CompileTimeErrorCode INVALID_ANNOTATION = CompileTimeErrorCode(
    "Annotation must be either a const variable reference or const "
        "constructor invocation.")