swc/crates/swc_ecma_parser/tests/tsc/mergedInterfacesWithInheritedPrivates.ts

class C {
    private x: number;
}

interface A extends C {
    y: string;
}

interface A {
    z: string;
}

class D implements A { // error
    private x: number;
    y: string;
    z: string;
}

class E implements A { // error
    x: number;
    y: string;
    z: string;
}

var a: A;
var r = a.x; // error