Imported Upstream version 5.4.0.167

Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa

mcs/errors/cs8198.cs

@@ -0,0 +1,19 @@
+// CS8198: An expression tree cannot contain out variable declaration
+// Line: 11
+
+using System;
+using System.Linq.Expressions;
+
+class C
+{
+	static void Main()
+	{
+		Expression<Func<bool>> e = () => Out (out int x);
+	}
+
+	static bool Out (out int value)
+	{
+		value = 3;
+		return true;
+	}
+}