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tests/cases/compiler/genericDerivedTypeWithSpecializedBase2.ts(11,1): error TS2322: Type 'B<number>' is not assignable to type 'A<{ length: number; foo: number; }>'.
Types of property 'x' are incompatible.
Type 'string' is not assignable to type '{ length: number; foo: number; }'.
==== tests/cases/compiler/genericDerivedTypeWithSpecializedBase2.ts (1 errors) ====
class A<T extends { length: number }> {
x: T;
}
class B<U> extends A<string> {
y: U;
}
var x: A<{ length: number; foo: number }>;
var y: B<number>;
x = y; // error
~
!!! error TS2322: Type 'B<number>' is not assignable to type 'A<{ length: number; foo: number; }>'.
!!! error TS2322: Types of property 'x' are incompatible.
!!! error TS2322: Type 'string' is not assignable to type '{ length: number; foo: number; }'.
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