=== tests/cases/compiler/null.ts ===
var x=null; 
>x : any, Symbol(x, Decl(null.ts, 0, 3))
>null : null

var y=3+x;  
>y : any, Symbol(y, Decl(null.ts, 1, 3))
>3+x : any
>3 : number
>x : any, Symbol(x, Decl(null.ts, 0, 3))

var z=3+null; 
>z : number, Symbol(z, Decl(null.ts, 2, 3))
>3+null : number
>3 : number
>null : null

class C {
>C : C, Symbol(C, Decl(null.ts, 2, 13))
}
function f() {
>f : () => C, Symbol(f, Decl(null.ts, 4, 1))

    return null;
>null : null

    return new C();
>new C() : C
>C : typeof C, Symbol(C, Decl(null.ts, 2, 13))
}
function g() {
>g : () => number, Symbol(g, Decl(null.ts, 8, 1))

    return null;
>null : null

    return 3;
>3 : number
}
interface I {
>I : I, Symbol(I, Decl(null.ts, 12, 1))

    x:any;
>x : any, Symbol(x, Decl(null.ts, 13, 13))

    y:number;
>y : number, Symbol(y, Decl(null.ts, 14, 10))
}
var w:I={x:null,y:3};
>w : I, Symbol(w, Decl(null.ts, 17, 3))
>I : I, Symbol(I, Decl(null.ts, 12, 1))
>{x:null,y:3} : { x: null; y: number; }
>x : null, Symbol(x, Decl(null.ts, 17, 9))
>null : null
>y : number, Symbol(y, Decl(null.ts, 17, 16))
>3 : number