==== tests/cases/compiler/propertyParameterWithQuestionMark.ts (2 errors) ====
    class C {
        constructor(public x?) { }
    }
    
    // x should not be an optional property
    var v: C = {}; // Should fail
        ~
!!! Type '{}' is not assignable to type 'C':
!!!   Property 'x' is missing in type '{}'.
    var v2: { x? }
    v = v2; // Should fail
    ~
!!! Type '{ x?: any; }' is not assignable to type 'C':
!!!   Required property 'x' cannot be reimplemented with optional property in '{ x?: any; }'.
    var v3: { x } = new C; // Should succeed