In what language or environment would recapturing and routing stdout be a desirable solution? Seeing that without a really good explanation would concern me. Th

In what language or environment would recapturing and routing stdout be a desirable solution? Seeing that without a really good explanation would concern me. That's a global hack with fun side effects that can lead to very confusing bugs. Also, you would lose which library is which log if you have to do this for more than one library. In Go, I would assume that a library that needs to log would do one or more of the following a) offer the ability to disable logging b) offer overriding the output that it uses for logging probably with an io.Writer interface or something c) accept a log.Logger or offer an interface that something like log.Logger meets. Ideally it would offer an interface that supports some key-value meta data to be able to have nicely structured logs with formatting independent of the library.