I don't think it is perfect for detecting "nothing was output" but we ended up feeling like this new design of (1) being explicit and (2) being stricter when -output is specified was a good balance to address all the different perspectives of folks using Elm. In that case, the compiler is going to give an error if you do not have a main defined or give a number of files that doesn't make sense.
Be stricter when folks use -output=elm.js or -output=index.html. Multiple collaborators can edit a learning page in real-time, just like a Google doc. easily embed interactive content, videos and images and style text with HTML/CSS. Code, run, share, and collaborate on Bash now Start Coding Bash for Free Now. I think being explicit about saying "Hey, I generated a file!" is helpful for understanding what the compiler is doing. Bash online compiler, IDE, and collaborative coding environment. Do something sensible for beginners just calling elm make and wanting to get a result. Note: Adding a `main` value can be as brief as adding something like this: Module compiles, switch to -output=/dev/null to skip the code gen phase 
Try adding a `main` value to your file? Or if you just want to verify that this Way () is definitely defined in the resulting file! When producing a JS file, I require that the given file has a `main` value.
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