Is there a way to identify a package as safe?

Let's restrict the imported packages to built-in ones. Now assuming a 
package only imports "strings" and "net/url" can it considered as safe? 
Since it does not (can not) modify the environment (most notably executing 

Of course the package still can behave in a malicious manner by (for 
example) creating too many goroutines.

This came to mind when I was reading about package managers and learnt some 
problems that they have. 

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