From c6ce6d3d007c291774c7f3b2f5d683b6113370a7 Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Mon, 6 Jun 2016 09:30:26 +0900
Subject: [PATCH] prefix identifiers starting with invalid characters with an
 underscore

---
 .../CSharp/Transforms/EscapeInvalidIdentifiers.cs            | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ICSharpCode.Decompiler/CSharp/Transforms/EscapeInvalidIdentifiers.cs b/ICSharpCode.Decompiler/CSharp/Transforms/EscapeInvalidIdentifiers.cs
index 868adb6fc..fd2636ea3 100644
--- a/ICSharpCode.Decompiler/CSharp/Transforms/EscapeInvalidIdentifiers.cs
+++ b/ICSharpCode.Decompiler/CSharp/Transforms/EscapeInvalidIdentifiers.cs
@@ -40,7 +40,10 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 		
 		string ReplaceInvalid(string s)
 		{
-			return string.Concat(s.Select(ch => IsValid(ch) ? ch.ToString() : string.Format("_{0:X4}", (int)ch)));
+			string name = string.Concat(s.Select(ch => IsValid(ch) ? ch.ToString() : string.Format("_{0:X4}", (int)ch)));
+			if (name.Length >= 1 && !(char.IsLetter(name[0]) || name[0] == '_'))
+				name = "_" + name;
+			return name;
 		}
 		
 		public void Run(AstNode rootNode, TransformContext context)