Make some parameters optional in ParserService.ResolveSnippet().

src/AddIns/Debugger/Debugger.AddIn/Service/WindowsDebugger.cs

@@ -585,7 +585,7 @@ namespace ICSharpCode.SharpDevelop.Services
 				throw new GetValueException("no stackframe available!");
 			var location = CurrentStackFrame.NextStatement;
 			var fileName = new FileName(location.Filename);
-			var rr = SD.ParserService.ResolveSnippet(fileName, new TextLocation(location.StartLine, location.StartColumn), new ParseableFileContentFinder().Create(fileName), code, null, System.Threading.CancellationToken.None);
+			var rr = SD.ParserService.ResolveSnippet(fileName, new TextLocation(location.StartLine, location.StartColumn), code);
 			return new ExpressionEvaluationVisitor(CurrentStackFrame, EvalThread, CurrentStackFrame.AppDomain.Compilation, allowMethodInvoke, allowSetValue).Convert(rr);
 		}
 

src/Main/Base/Project/Parser/IParserService.cs

@@ -242,9 +242,9 @@ namespace ICSharpCode.SharpDevelop.Parser
 		                      ITextSource fileContent = null, ICompilation compilation = null,
 		                      CancellationToken cancellationToken = default(CancellationToken));
 		
-		ResolveResult ResolveSnippet(FileName fileName, TextLocation fileLocation,
+		ResolveResult ResolveSnippet(FileName fileName, TextLocation fileLocation, string codeSnippet,
-		                             ITextSource fileContent, string codeSnippet, ICompilation compilation,
+		                             ITextSource fileContent = null, ICompilation compilation = null,
-		                             CancellationToken cancellationToken);
+		                             CancellationToken cancellationToken = default(CancellationToken));
 		
 		Task<ResolveResult> ResolveAsync(FileName fileName, TextLocation location,
 		                                 ITextSource fileContent = null, ICompilation compilation = null,

src/Main/SharpDevelop/Parser/ParserService.cs

@@ -315,7 +315,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 			return context;
 		}
 		
-		public ResolveResult ResolveSnippet(FileName fileName, TextLocation fileLocation, ITextSource fileContent, string codeSnippet, ICompilation compilation, CancellationToken cancellationToken)
+		public ResolveResult ResolveSnippet(FileName fileName, TextLocation fileLocation, string codeSnippet, ITextSource fileContent, ICompilation compilation, CancellationToken cancellationToken)
 		{
 			var entry = GetFileEntry(fileName, true);
 			if (entry.parser == null)