.solution("Remove the annotation")
    }

    String optionalOnPrimitive(@DelegatesTo(value = OptionalOnPrimitive, strategy = Closure.DELEGATE_FIRST) Closure<?> spec = {}) {
        OptionalOnPrimitive config = optionalOnPrimitiveConfig(spec)
        config.render()
    }

    OptionalOnPrimitive optionalOnPrimitiveConfig(@DelegatesTo(value = OptionalOnPrimitive, strategy = Closure.DELEGATE_FIRST) Closure<?> spec) {

Possible solution: Remove the annotation.

${validationMessage("invalid_use_of_cacheable_annotation")}
"""
    }

    def "tests output of optionalOnPrimitive"() {
        when:
        render optionalOnPrimitive {
            type('Person').property('age')
            primitive(int.class)
            includeLink()
        }

        then:
        outputEquals """