Imported Upstream version 3.12.0

Former-commit-id: cf92446697332992ec36726e78eb8703e1f259d7

mcs/errors/cs8046.cs

@@ -0,0 +1,19 @@
+// CS8046: An expression tree cannot contain a declaration expression
+// 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;
+	}
+}