=== tests/cases/compiler/assignmentCompatFunctionsWithOptionalArgs.ts ===
function foo(x: { id: number; name?: string; }): void;
>foo : (x: {    id: number;    name?: string;}) => void
>x : { id: number; name?: string; }
>id : number
>name : string

foo({ id: 1234 });                 // Ok
>foo({ id: 1234 }) : void
>foo : (x: { id: number; name?: string; }) => void
>{ id: 1234 } : { id: number; }
>id : number
>1234 : 1234

foo({ id: 1234, name: "hello" });  // Ok
>foo({ id: 1234, name: "hello" }) : void
>foo : (x: { id: number; name?: string; }) => void
>{ id: 1234, name: "hello" } : { id: number; name: string; }
>id : number
>1234 : 1234
>name : string
>"hello" : "hello"

foo({ id: 1234, name: false });    // Error, name of wrong type
>foo({ id: 1234, name: false }) : void
>foo : (x: { id: number; name?: string; }) => void
>{ id: 1234, name: false } : { id: number; name: boolean; }
>id : number
>1234 : 1234
>name : boolean
>false : false

foo({ name: "hello" });            // Error, id required but missing
>foo({ name: "hello" }) : void
>foo : (x: { id: number; name?: string; }) => void
>{ name: "hello" } : { name: string; }
>name : string
>"hello" : "hello"