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tests/cases/compiler/arrayOfSubtypeIsAssignableToReadonlyArray.ts(13,1): error TS2322: Type 'A[]' is not assignable to type 'readonly B[]'.
Property 'b' is missing in type 'A' but required in type 'B'.
tests/cases/compiler/arrayOfSubtypeIsAssignableToReadonlyArray.ts(18,1): error TS2322: Type 'C<A>' is not assignable to type 'readonly B[]'.
The types returned by 'concat(...)' are incompatible between these types.
Type 'A[]' is not assignable to type 'B[]'.
Type 'A' is not assignable to type 'B'.
==== tests/cases/compiler/arrayOfSubtypeIsAssignableToReadonlyArray.ts (2 errors) ====
class A { a }
class B extends A { b }
class C<T> extends Array<T> { c }
declare var ara: A[];
declare var arb: B[];
declare var cra: C<A>;
declare var crb: C<B>;
declare var rra: ReadonlyArray<A>;
declare var rrb: ReadonlyArray<B>;
rra = ara;
rrb = arb; // OK, Array<B> is assignable to ReadonlyArray<A>
rra = arb;
rrb = ara; // error: 'A' is not assignable to 'B'
~~~
!!! error TS2322: Type 'A[]' is not assignable to type 'readonly B[]'.
!!! error TS2322: Property 'b' is missing in type 'A' but required in type 'B'.
!!! related TS2728 tests/cases/compiler/arrayOfSubtypeIsAssignableToReadonlyArray.ts:2:21: 'b' is declared here.
rra = cra;
rra = crb; // OK, C<B> is assignable to ReadonlyArray<A>
rrb = crb;
rrb = cra; // error: 'A' is not assignable to 'B'
~~~
!!! error TS2322: Type 'C<A>' is not assignable to type 'readonly B[]'.
!!! error TS2322: The types returned by 'concat(...)' are incompatible between these types.
!!! error TS2322: Type 'A[]' is not assignable to type 'B[]'.
!!! error TS2322: Type 'A' is not assignable to type 'B'.
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