发生了什么问题？

The behaviour of the code does not algined with the language specification: ** "Ambient functions cannot have parameters with default values but can have optional parameters." **

However, current compiler outputs the error message:

TypeError: Native, Abstract and Declare methods cannot have body.

期望行为是什么？

Compiled successfully

如何复现该缺陷

declare function baz(x? : int, y?: number) : void

function main() : int {
    return 0
}

其他补充信息

版本或分支信息

• master
• Release 4.1
• Release 4.0
• Release 3.2