There are chances that other function names will change the signature to match 
interfaces in your GOPATH, in which case Gogland will not mark the function as 
unused since it won't know if it's needed to implement that interface or not 
(given how interfaces work in Go). 

Since Gogland looks in your whole GOPATH for usages of the package.Function and 
it can't find any, it then marks the function as unused.

If you want to have the function shown as use regardless of its name, there's a 
simple way to do so: write a test for it.

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