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go - Does it make sense to have two packages in the same directory?

I have a project that provides a library (exports some funcs) and also must provide a command-line interface (there must be an executable file).

Example of directory structure:

whatever.io/
    myproject/
        main.go
        myproject.go

The go compiler needs the package main and func main to start execution. My library needs the package myproject where I put stuff on it. This is what the go tool says when I am building another project that tries to import myproject:

main.go:5:2: found packages myproject (myproject.go) and main (main.go) in $GOPATH/src/whatever.io/myproject

So I believe there is no way to do it.

Should I move the library or the CLI to another package?

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