How to not import `with` from Kernel so it can be redefined

[josevalim]

@Crowdhailer Yes, exactly. All special forms have one or more properties that would make it impossible or undesirable to be implemented as a macro. For with, it accepts a variable number of arguments, which is a feature that is not available to any macro.

The term came from lisps, which also have special forms.

@Qqwy

As a side note: What you can do is create a macro that reads in AST including with used in a custom way. As long as its syntax will look similar enough to the way the built-in with is used, this will work, and your macro can alter the AST in any way it sees fit (such as rewriting the passed with to what you want it to represent).

There is a very simple variation of this and not as invasive which is to prefix the with special form with a macro and that way you can emulate var args:

async with left <- right,
          foo <- bar do
  {left, foo}
end