Switch keyword in switch expression has incorrect scope

[alexr00]

Originally from @marlongerson in microsoft/vscode#103423

Details

What editor are you seeing the problem in? (e.g. Atom, Visual Studio Code, etc.)
VS Code
What version of the editor are you using?
1.47.2, 1.48
What color theme are you using?
N/A

Repro

public enum Foo
{
    Bar,
    Baz,
}

public class A
{
    public int B(Foo foo) =>
        foo switch
        {
            Foo.Bar => 0,
            Foo.Baz => 1,
        };
}

1. Create switch expression
2. Notice that switch keyword is not syntax highlighted.

[wise0704]

Already handled in switch-expression @JoeRobich

[JoeRobich]

Confirmed.