Commits on Oct 8, 2023

1. Main entrypoint take 3 - revenge of the macro …

   As they say, if at first you don't succeed, try again, then
   try again, add an extra layer of indirection and take a little
   bit of spice from every other idea and you've got yourself a wedding
   cake. Or something like that, I don't know - at times it felt like
   this cake was getting a bit burnt.
   
   Where was I?
   
   Ah yes.
   
   This is the third edition of the main saga (#50974, #51417). In
   this version, the spelling that we'd expect for the main use case is:
   ```
   function (@main)(ARGS)
       println("Hello World")
   end
   ```
   
   This syntax was originally proposed by `@vtjnash`. However, the semantics
   here are slightly different. `@main` simply expands to `main`, so the above
   is equivalent to:
   ```
   function main(ARGS)
       println("Hello World")
   end
   @main
   ```
   
   So `@main` is simply a marker that the `main` binding has special behavior.
   This way, all the niceceties of import/export, etc. can still be used
   as in the original `Main.main` proposal, but there is an explicit
   opt-in and feature detect macro to avoid executing this when people
   do not expect.
   
   Additionally, there is a smooth upgrade path if we decide to automatically
   enable `Main.main` in Julia 2.0.

   

   Keno committed Oct 8, 2023
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