scoped imports

[Timothee Cour]

Is there a way to achieve this:

----
module foo;

{
import bar;
void fun1(){bar.barfun();}
void fun2(bar.BarType a){}
}

// now bar is not in scope anymore.
void fun3(){}
----

This would reduce name clashes conflicts, ease refactorings and in general
make code a bit cleaner.

Related question:

Why isn't the following allowed:
----
void fun(){
// code without version=A
  version=A;
// code with version=A
  vesion(none):
//code versioned out
}
----
I understand the grammar doesn't allow it, but what's the rationale, and
can it be fixed?
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