Golang-如何检查其他源文件中引用的功能？

I'm a fresh man of golang and here is my problem:

1. I have a array of function names like this: [FunctionA FunctionB]
2. I want to check if those functions are referenced in other source files like: somefile.go.

What is the best way to achieve this?

In one word: How can I verify some functions are used in other source files in golang?

[Update]

Yes, it's something like grep -rl "funcName" files, but how can I omit comments in this case?