Environment variables are the bane of my existence 
This article makes a good point about Java's main method. Its privileged status makes it a fine starting point for reasoning about a program. However, it would be better if its signature encapsulated all the inputs to your program: not just args, but env vars and I/O streams too.https://twitter.com/adamwarski/status/963768358821859328 …
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Coeffects? I mean some programs wouldn't have environment variables (eg. targeting HaLVM/MirageOS).
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Yeah, agree. I think of main() as part of the runtime. All it does is gather all the environmental bits that it needs to construct and execute the "real" program
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I like to think of it as "the end of the world" as so many FP folk like to put it
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Isn't your program just side effecting? Isn't it?
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Well, that main method is never going to be pure, but I think it's useful to be closer to purity. It should also return an exit-status integer!
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You could roll that env thing yourself a bit like the scalaz SafeApp thingie?
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Yes, I'm considering it! Different implementations could be provided for different runtimes (well, Scala.js) but I think it would just be convention that stops people accessing environment variables through System.getenv. Or maybe a SecurityManager could help?
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