anchor.diff:  
         var sass = await watch(["dir:out"]);
         await expectLater(
  -          sass.stdout, emits('Compiled dir/test.scss to out/test.css.'));
  +          sass.stdout, emits(_compiled('dir/test.scss', 'out/test.css')));
         await expectLater(sass.stdout, _watchingForChanges);
   
         await d.dir("dir", [d.file("test.scss", "x {y: z}")]).create();
         await expectLater(
  -          sass.stdout, emits('Compiled dir/test.scss to out/test.css.'));
  +          sass.stdout, emits(_compiled('dir/test.scss', 'out/test.css')));
         await sass.kill();
   
         await d.dir("out", [
  
positive.code: 
      await d.dir("dir", [d.file("test.scss", "a {b: c}")]).create();
      await expectLater(
          sass.stdout, emits('Compiled dir/test.scss to out/test.css.'));
      await sass.kill();
  
      await d.dir("out", [
  
negative.code: 
        var sass = await watch(["dir:out"]);
        await expectLater(
            sass.stdout, emits(_compiled('dir/test.scss', 'out/test.css')));
        await expectLater(sass.stdout, _watchingForChanges);
  
        new File(p.join(d.sandbox, "dir", "test.scss")).deleteSync();
        await expectLater(
            sass.stdout, emits('Deleted ${p.join('out', 'test.css')}.'));
        await sass.kill();
  
        await d.dir("dir", [d.nothing("out.css")]).validate();
  