Change "catch if" to "catch when"

NRefactory/ICSharpCode.NRefactory.CSharp/Ast/Statements/TryCatchStatement.cs

@@ -90,8 +90,8 @@ namespace ICSharpCode.NRefactory.CSharp
 	public class CatchClause : AstNode
 	{
 		public static readonly TokenRole CatchKeywordRole = new TokenRole ("catch");
-		public static readonly TokenRole IfKeywordRole = IfElseStatement.IfKeywordRole;
+		public static readonly TokenRole WhenKeywordRole = new TokenRole ("when");
-		public static readonly Role<Expression> ConditionRole = IfElseStatement.ConditionRole;
+		public static readonly Role<Expression> ConditionRole = Roles.Condition;
 
 		#region Null
 		public new static readonly CatchClause Null = new NullCatchClause ();
@@ -214,8 +214,8 @@ namespace ICSharpCode.NRefactory.CSharp
 			get { return GetChildByRole (Roles.RPar); }
 		}
 		
-		public CSharpTokenNode IfToken {
+		public CSharpTokenNode WhenToken {
-			get { return GetChildByRole (IfKeywordRole); }
+			get { return GetChildByRole (WhenKeywordRole); }
 		}
 		
 		public Expression Condition {

NRefactory/ICSharpCode.NRefactory.CSharp/OutputVisitor/CSharpOutputVisitor.cs

@@ -1677,7 +1677,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 			if (!catchClause.Condition.IsNull) {
 				Space();
-				WriteKeyword(CatchClause.IfKeywordRole);
+				WriteKeyword(CatchClause.WhenKeywordRole);
 				Space(policy.SpaceBeforeIfParentheses);
 				LPar();
 				Space(policy.SpacesWithinIfParentheses);