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> [It] forces programmers to know the name of all global variables and      
> avoid them, to prevent them from being changed unadvertently. I wonder  
> how the proposed global in ... statement brings adequate solace for     
> that problem.                                                           

The idea is that, optionally, you can have a declaration like

  global in nil


  global in {}

Then, any access to a non-declared variable wouldn't affect a global
variable (in the first option it would be an error, in the second it
would access a "static" variable). With proper support, we could have
other options, like

  global in ReadOnly(globals())

where you could only read undeclared global variables, but any write
would trigger an error.

-- Roberto