gistfile1.txt

     public ResolveResult ResolveSnippet(ParseInformation parseInfo, TextLocation location, string codeSnippet, ICompilation compilation, CancellationToken cancellationToken)
        {
            var csParseInfo = parseInfo as CSharpFullParseInformation;
            if (csParseInfo == null)
                throw new ArgumentException("Parse info does not have SyntaxTree");
            CSharpAstResolver contextResolver = new CSharpAstResolver(compilation, csParseInfo.SyntaxTree, csParseInfo.UnresolvedFile);
            var node = csParseInfo.SyntaxTree.GetNodeAt(location);
            CSharpResolver context;
            if (node != null)
                context = contextResolver.GetResolverStateAfter(node, cancellationToken);
            else
                context = new CSharpResolver(compilation);
            CSharpParser parser = new CSharpParser();
            var expr = parser.ParseExpression(codeSnippet);
            if (parser.HasErrors)
                return new ErrorResolveResult(SpecialType.UnknownType, PrintErrorsAsString(parser.Errors), TextLocation.Empty);
            CSharpAstResolver snippetResolver = new CSharpAstResolver(context, expr);
            return snippetResolver.Resolve(expr, cancellationToken);
        }