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go - Finding functions that return a specific type

Perhaps this is a silly question, but is there a way to find all functions (in the standard library or GOPATH) that return a specific type?

For example there are many functions that take io.Writer as an argument. Now I want to know how to create an io.Writer and there are many ways to do so. But how can I find all the ways easily without guessing at packages and looking through all the methods to find those that return an io.Writer (or whatever other type I'm after)?

Edit: I should extend my question to also find types that implement a specific interface. Sticking with the io.Writer example (which admittedly was a bad example for the original question) it would be good to have a way to find any types that implement the Writer interface, since those types would be valid arguments for a function that takes takes an io.Writer and thus answer the original question when the type is an interface.

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