=== tests/cases/conformance/es6/Symbols/symbolType18.ts ===
interface Foo { prop }
>Foo : Foo
>prop : any

var x: symbol | Foo;
>x : symbol | Foo
>Foo : Foo

x;
>x : symbol | Foo

if (typeof x === "object") {
>typeof x === "object" : boolean
>typeof x : string
>x : symbol | Foo
>"object" : string

    x;
>x : Foo
}
else {
    x;
>x : symbol | Foo
}