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tests/cases/compiler/generics4.ts(7,1): error TS2322: Type 'C<Y>' is not assignable to type 'C<X>'.
Type 'Y' is not assignable to type 'X'.
The types returned by 'f()' are incompatible between these types.
Type 'boolean' is not assignable to type 'string'.
==== tests/cases/compiler/generics4.ts (1 errors) ====
class C<T> { private x: T; }
interface X { f(): string; }
interface Y { f(): boolean; }
var a: C<X>;
var b: C<Y>;
a = b; // Not ok - return types of "f" are different
~
!!! error TS2322: Type 'C<Y>' is not assignable to type 'C<X>'.
!!! error TS2322: Type 'Y' is not assignable to type 'X'.
!!! error TS2322: The types returned by 'f()' are incompatible between these types.
!!! error TS2322: Type 'boolean' is not assignable to type 'string'.
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