Class extension in generics does not work when using Partial.

[TomerKr]

TypeScript Version: 2.3.2 (or whatever is running in the playground, something similar is reproduced locally of course.)

Code

class Foo{
    something: boolean;
    something2: boolean;
}

class MyClass<T extends Foo>{
    func(x): Partial<T>{
        return {
            something: true
        }
    }
}

Expected behavior:
The code is valid and the TS compiler recognizes that T in the context of MyClass can have a 'something' field.

Actual behavior:
The code does not compile. The error is: "Type '{ something: true; }' is not assignable to type 'Partial'."

[RyanCavanaugh]

Duplicate #12731

[TomerKr]

I'll be closing this issue then and try discussing it in the duplicate. Thanks.