tests/cases/compiler/instanceSubtypeCheck2.ts(5,7): error TS2415: Class 'C2<T>' incorrectly extends base class 'C1<T>'.
  Types of property 'x' are incompatible.
    Type 'string' is not assignable to type 'C2<T>'.
      Property 'x' is missing in type 'String'.


==== tests/cases/compiler/instanceSubtypeCheck2.ts (1 errors) ====
    class C1<T> {
        x: C2<T>;
    }
    
    class C2<T> extends C1<T> {
          ~~
!!! error TS2415: Class 'C2<T>' incorrectly extends base class 'C1<T>'.
!!! error TS2415:   Types of property 'x' are incompatible.
!!! error TS2415:     Type 'string' is not assignable to type 'C2<T>'.
!!! error TS2415:       Property 'x' is missing in type 'String'.
        x: string
    }