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go - Compare error message in golang

Let's say I create a new error in golang like so

err := errors.New("SOME_COMMON_ERROR_CODE")

In java, I'm used to being able to get Exception with GetMessage() messages. How would I compare that error if returned?

if some_err := some_package.DoSomething(); some_err != nil {
    if some_err.GetMessage() == "SOME_COMMON_ERROR_CODE" {
        // handle it however.
    }
}

How is this done in golang?

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