Fixed invalid expression statement.

ICSharpCode.NRefactory.CSharp/Parser/CSharpParser.cs

@@ -1462,9 +1462,9 @@ namespace ICSharpCode.NRefactory.CSharp
 				var result = new ExpressionStatement ();
 				if (statementExpression.Expression == null)
 					return result;
-				object expr = statementExpression.Expression.Accept (this);
+				var expr = statementExpression.Expression.Accept (this) as Expression;
 				if (expr != null)
-					result.AddChild ((Expression)expr, ExpressionStatement.Roles.Expression);
+					result.AddChild (expr, ExpressionStatement.Roles.Expression);
 				var location = LocationsBag.GetLocations (statementExpression);
 				if (location != null)
 					result.AddChild (new CSharpTokenNode (Convert (location[0]), 1), ExpressionStatement.Roles.Semicolon);

ICSharpCode.NRefactory.CSharp/Parser/mcs/cs-parser.cs

@@ -7751,7 +7751,7 @@ void case_768()
 		ExpressionStatement s = yyVals[0+yyTop] as ExpressionStatement;
 		if (s == null) {
 			Expression.Error_InvalidExpressionStatement (report, GetLocation (yyVals[0+yyTop]));
-			yyVal = new StatementExpression (new InvalidExpressionStatement (yyVals[0+yyTop] as Expression));
+			yyVal = new InvalidExpressionStatement (yyVals[0+yyTop] as Expression);
 		} else {
 			yyVal = new StatementExpression (s);
 		}

ICSharpCode.NRefactory.CSharp/Parser/mcs/ecore.cs

@@ -6288,7 +6288,7 @@ namespace Mono.CSharp {
 		}
 	}
 	
-	public class InvalidExpressionStatement : ExpressionStatement
+	public class InvalidExpressionStatement : Statement
 	{
 		public Expression Expression {
 			get;
@@ -6300,22 +6300,22 @@ namespace Mono.CSharp {
 			this.Expression = expr;
 		}
 		
-		public override void EmitStatement (EmitContext ec)
+		public override void Emit (EmitContext ec)
 		{
 			// nothing
 		}
 		
-		public override void Emit (EmitContext ec)
+		protected override void DoEmit (EmitContext ec)
 		{
 			// nothing
 		}
 		
-		public override Mono.CSharp.Expression CreateExpressionTree (ResolveContext ec)
+		protected override void CloneTo (CloneContext clonectx, Statement target)
 		{
-			return null;
+			// nothing
 		}
 		
-		protected override Mono.CSharp.Expression DoResolve (ResolveContext rc)
+		public override Mono.CSharp.Expression CreateExpressionTree (ResolveContext ec)
 		{
 			return null;
 		}