C-style languages tend to have squiggly brackets which can limit scope somewhat, but not as totally as you describe.

For example:

   doThing(){
      x = 7; //x visible in whole function
      {
         y = x*2; //y only visible in this block.
      }
      // x still visible, y no longer visible
   }

Explicitly removing things from scope doesn't seem to be a feature though.