tests/cases/compiler/propertyParameterWithQuestionMark.ts(6,5): error TS2322: Type '{}' is not assignable to type 'C'.
  Property 'x' is missing in type '{}'.
tests/cases/compiler/propertyParameterWithQuestionMark.ts(8,1): error TS2322: Type '{ x?: any; }' is not assignable to type 'C'.
  Property 'x' is optional in type '{ x?: any; }' but required in type 'C'.


==== tests/cases/compiler/propertyParameterWithQuestionMark.ts (2 errors) ====
    class C {
        constructor(public x?) { }
    }
    
    // x should not be an optional property
    var v: C = {}; // Should fail
        ~
!!! error TS2322: Type '{}' is not assignable to type 'C'.
!!! error TS2322:   Property 'x' is missing in type '{}'.
    var v2: { x? }
    v = v2; // Should fail
    ~
!!! error TS2322: Type '{ x?: any; }' is not assignable to type 'C'.
!!! error TS2322:   Property 'x' is optional in type '{ x?: any; }' but required in type 'C'.
    var v3: { x } = new C; // Should succeed