Goto def on complex pattern member name doesn't work.

[CyrusNajmabadi]

Given this code:

    public class Expression { }
    public class Constant : Expression
    {
        public readonly int Value;
        public Constant(int Value)
        {
            this.Value = Value;
        }
    }
    public class Plus : Expression
    {
        public readonly Expression Left, Right;
        public Plus(Expression Left, Expression Right)
        {
            this.Left = Left;
            this.Right = Right;
        }
    }
    public class X
    {
        public static void Main()
        {
            Expression expr = null;
            if (expr is Plus { $$Left is Plus })

Goto def on Left (in the last line) does not work.

[jaredpar]

Reopen pending unit tests.

[gafter]

Fixed in features/patterns.