Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

mcs/errors/cs8075.cs

@@ -0,0 +1,19 @@
+// CS8075: An expression tree cannot contain a collection initializer with extension method
+// Line: 12
+
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+
+class Program
+{
+	static void Main()
+	{
+		Expression<Func<Stack<int>>> e = () => new Stack<int> { 42 };		
+	}
+}
+
+static class X
+{
+	public static void Add<T>(this Stack<T> s, T value) => s.Push (value);
+}