Errors:
test/Test72.java:18:
  Semantic Error: keyword with expected rather than woth
test/Test72.java:18:
  Semantic Error: keyword root expected rather than ruot
test/Test72.java:18:
  Semantic Error: Initial value of type java.util.HashSet<test.Test72.A> is not assign convertible to java.util.Collection<test.Test72.B>
test/Test72.java:18,63:
  Semantic Error: no visible type named X
test/Test72.java:22:
  Semantic Error: reference must bind to a node of type test.Test72.A
test/Test72.java:23:
  Semantic Error: boolean condition expected rather than int
test/Test72.java:23:
  Semantic Error: contribution must be subtype of test.Test72.B which int is not
test/Test72.java:26:
  Semantic Error: could not find collection attribute set2 in test.Test72.A
test/Test72.java:31:
  Semantic Error: could not find method adds taking a single argument in java.util.Collection<test.Test72.B>