Why doesn't C# VS2017 intellisense work with var and local functions?

Question

Why doesn't Intellisense work if I do something like this.

It does work though if I explicitly declare Foo

Answer 1

The problem reproes. It is a problem with parsing incomplete code.

The line that you started ( foo. ) gets parsed together with the local function on the line below. This causes the local function not to be parsed correctly, so VS doesn't know that GetFoo is a local function any more or that it returns a Foo .

Answer 2

This is likely a bug in visual studio. As a work around, you can get the intellisense to play nice in this situation by declaring GetFoo at the top of your function's scope.

void Test()
{
    Foo GetFoo() => new Foo();

    var foo = GetFoo();
    foo.DoThing();

}

I observe the same behavior you have when placing the GetFoo declaration below the point in which I'm trying to use it, so it would seem that order matters.