=== tests/cases/compiler/functionAssignmentError.ts ===
var func = function (){return "ONE";};
>func : () => string
>function (){return "ONE";} : () => string
>"ONE" : string

func = function (){return "ONE";};
>func = function (){return "ONE";} : () => string
>func : () => string
>function (){return "ONE";} : () => string
>"ONE" : string