特征中的 Groovy 命名参数

问：

给定的 groovy 转换示例 - 一切都按预期工作：@NamedVariant

import groovy.transform.NamedVariant

class A {
    @NamedVariant
    def func(String key1 = "val1", String key2 = "val2") {
        print "key1=$key1, key=$key2"
    }
}

new A().func(key2: "xxx")

但是当我移动到这样的特征时：func

import groovy.transform.NamedVariant

class A implements B {}

trait B {
    @NamedVariant
    def func(String key1 = "val1", String key2 = "val2") {
        print "key1=$key1, key=$key2"
    }
}

new A().func(key2: "xxx")

编译失败，并显示以下错误消息：

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
ideaGroovyConsole.groovy: -1: Error during @NamedVariant processing. Class B$Trait$Helper already has a named-arg method of type [org.codehaus.groovy.ast.Parameter@6fd1660[name: namedArgs, type: java.util.Map, hasDefaultValue: false]]
 @ line -1, column -1.

时髦的支持是改变了内部特征还是我做错了什么？@NamedVariant