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Lookup types and polymorphic this issue #12723

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@dsehnal

Description

@dsehnal

TypeScript Version: 2.1.4

Code

interface A<T> { value: T }
interface B extends A<string> { }

abstract class C<T extends A<any>> {
    private t: T;
    get a(): this['t']['value'] { return this.t.value };
}

class D extends C<B> {
    get b() { return this.a; }
}

Expected behavior:

I would expect that the type of D.b would be string.

Actual behavior:

Type of D.b is any

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