File and directory structure for a hybrid project

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I have a project that consists of a library (that will be split over several 
files but will have a single file as its entry point) and an executable that 
uses the library but which doesn't share its name. At the moment I have this 
layout: 
    
    
    src/myexe.nim
    src/mypkg/mypkg.nim
    src/mypkg/support1.nim
    
    
    Run

but when I run `nimble test` I get a warning about the structure.

So, what should the structure be?