[639603] Don't emit statements as expressions when they don't support…

… it.

mcs/mcs/eval.cs

@@ -1186,32 +1186,12 @@ protected override Expression DoResolve (ResolveContext ec)
 			}
 
 			// This means its really a statement.
-			if (clone.Type == TypeManager.void_type){
-				source = source.Resolve (ec);
-				target = null;
-				type = TypeManager.void_type;
-				eclass = ExprClass.Value;
-				return this;
+			if (clone.Type == TypeManager.void_type || clone is DynamicInvocation || clone is Assign) {
+				return clone;
 			}
 
 			return base.DoResolve (ec);
 		}
-
-		public override void Emit (EmitContext ec)
-		{
-			if (target == null)
-				source.Emit (ec);
-			else
-				base.Emit (ec);
-		}
-
-		public override void EmitStatement (EmitContext ec)
-		{
-			if (target == null)
-				source.Emit (ec);
-			else
-				base.EmitStatement (ec);
-		}
 	}
 
 	public class Undo {