does nice have separate compilation, or does it effectively "compile" a whole program at a time?

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Does nice have separate compilation, or does it effectively  "compile"
a whole program at a time? 


package test.shape;
abstract class Shape {}
void intersect(Shape s1, Shape s2);


package test.circle;
import test.shape;
class Circle extends Shape {}
intersect(Circle s1, Circle s2){}


package test.rectangle;
import test.shape;
class Rectangle extends Shape {}
intersect(Rectangle s1, Rectangle s2){}


package test.intersect;
import test.shape;
import test.circle;
import test.rectangle;
intersect(Circle s1, Rectangle s2){ println("circle rectangle"); }
intersect(Rectangle s1, Circle s2){ println("rectangle circle"); }


package test.hoop;
import test.shape;
void testIntersect(Shape s1, Shape s2){ s1.intersect(s2); }


package test;
import test.shape;
import test.rectangle;
import test.circle;
import test.intersect;
import test.hoop;

void main(String[] args){
   let r = new Rectangle();
   let c = new Circle();

   testIntersect(c,r);
   testIntersect(c,c);
   testIntersect(r,c);
   testIntersect(r,r);  
}


Nice compiler version 0.9.11 (build 2005.06.09, 04:36:48 UTC)

1) I:\Nice\Test>nicec --sourcepath .. --classpath .. -a test.jar test
compiles OK

2) hide shape.nice, circle.nice, intersect.nice, hoop.nice

3) retract intersect implementation in rectangle.nice 
//intersect(Rectangle s1, Rectangle s2){}

4) I:\Nice\Test>nicec --sourcepath .. --classpath .. -a test.jar test
nice.lang: parsing
test.shape: parsing
test.rectangle: parsing
test.circle: parsing
test.intersect: parsing

I:\Nice\test\package.nicei: line 6, column 8:
test.intersect must be compiled, but no source code is available.
The source path is: ..
compilation failed with 1 error




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