Fixed regression around foreach-on-string introduced in 16134e52e4

ICSharpCode.Decompiler.Tests/TestCases/Pretty/Loops.cs

@@ -20,6 +20,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
+using System.Text;
 
 namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 {
@@ -614,6 +615,18 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 			}
 		}
 
+		private static void AppendNamePart(string part, StringBuilder name)
+		{
+			foreach (char c in part)
+			{
+				if (c == '\\')
+				{
+					name.Append('\\');
+				}
+				name.Append(c);
+			}
+		}
+
 		public void NoForeachOverArray(string[] array)
 		{
 			for (int i = 0; i < array.Length; i++)

ICSharpCode.Decompiler/CSharp/Transforms/PatternStatementTransform.cs

@@ -348,10 +348,9 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 			var itemVariable = m.Get<IdentifierExpression>("itemVariable").Single().GetILVariable();
 			var indexVariable = m.Get<IdentifierExpression>("indexVariable").Single().GetILVariable();
 			var arrayVariable = m.Get<IdentifierExpression>("arrayVariable").Single().GetILVariable();
-			var loopContainer = forStatement.Annotation<IL.BlockContainer>();
 			if (itemVariable == null || indexVariable == null || arrayVariable == null)
 				return null;
-			if (arrayVariable.Type.Kind != TypeKind.Array)
+			if (arrayVariable.Type.Kind != TypeKind.Array && !arrayVariable.Type.IsKnownType(KnownTypeCode.String))
 				return null;
 			if (!VariableCanBeUsedAsForeachLocal(itemVariable, forStatement))
 				return null;