Add static 'namespace' name-binding and aliasing

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Add static 'namespace' name-binding and aliasing

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re: #5
{{{
namespace B { void f(); }

namespace N;

using namespace B; # injects B.* into search path

f();   # Calls B::f

using V::W::x; # Declares x, as it is, in current scope.

say(x.name);

using namespace A {  # This declares 't', 'u' in current block, not into A,
   using t;   # because (1) they're already in A, duh, and (2) A is read-only in
   using u;   # the search path - declarations go into N.
}

say(t + u);  # Prints A::t + A::u

f(x.height + u); # Calls B::f with sum of V::W::x.height and A::u

namespace F = C::D::E;  # Sets namespace alias

say(F::oo);  # Prints C::D::E::oo.

Original comment by [email protected] on 9 Jul 2009 at 11:47