=== tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts ===
interface C {
>C : C

    x?: number;
>x : number
}

interface C2 {
>C2 : C2

    x: number;
>x : number
}

interface A extends C, C2 { // error
>A : A
>C : C
>C2 : C2

    y: string;
>y : string
}
