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  1. class Variance<+Out,-In> {
  2.   foo(x: Out): Out { return x; }
  3.   bar(y: In): In { return y; }
  4. }
  5.  
  6. class A { }
  7. class B extends A { }
  8.  
  9. function subtyping(
  10.   v1: Variance<A,B>,
  11.   v2: Variance<B,A>
  12. ) {
  13.   (v1: Variance<B,A>); // error on both targs (A ~/~> B)
  14.   (v2: Variance<A,B>); // OK for both targs (B ~> A)
  15. }
  16.  
  17. class PropVariance<+Out,-In> {
  18.   inv1: Out; // error
  19.   inv2: In; // error
  20.   -co1: Out; // error
  21.   -co2: In; // ok
  22.   +con1: Out; // ok
  23.   +con2: In; // error
  24.  
  25.   inv_dict1: {[k:string]: Out}; // error
  26.   inv_dict2: {[k:string]: In}; // error
  27.   co_dict1: {+[k:string]: Out}; // ok
  28.   co_dict2: {+[k:string]: In}; // error
  29.   con_dict1: {-[k:string]: Out}; // error
  30.   con_dict2: {-[k:string]: In}; // ok
  31. }
  32.  
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