Error parsing CXXDeductionGuide

Start with the C++17 reproduction in the issue, focusing on the CXXDeductionGuide diagnostic and the resulting parser crash. Then investigate the separate precompiled-header case involving and the undeclared assert error. Done means the deduction-guide input no longer crashes parsing and the precompiled-header behavior is understood or corrected.

Consider:

using CppSharp;
using CppSharp.AST;
using CppSharp.Parser;

class Program
{
    class TestLibrary : ILibrary
    {
        public void SetupPasses(Driver driver)
        {
        }

        public void Preprocess(Driver driver, ASTContext ctx)
        {
        }

        public void Postprocess(Driver driver, ASTContext ctx)
        {
        }

        public void Setup(Driver driver)
        {
            DriverOptions driverOptions = driver.Options;
            ParserOptions parserOptions = driver.ParserOptions;

            parserOptions.LanguageVersion = LanguageVersion.CPP17;
            parserOptions.AddCompilationOptions("-frtti");

            driverOptions.Quiet = false;
            driverOptions.DryRun = true;
            driverOptions.OutputDir = Directory.GetCurrentDirectory();

            var module = driverOptions.AddModule("test");

            string temp = Path.GetTempFileName();
            File.WriteAllText(temp, @"
template<class T>
struct container
{
    container(T t) {}
 
    template<class Iter>
    container(Iter beg, Iter end);
};
 
// additional deduction guide
template<class Iter>
container(Iter b, Iter e) -> container<typename std::iterator_traits<Iter>::value_type>;
");

            module.Headers.Add(temp);

        }
    }

    static void Main(string[] args)
    {
        ConsoleDriver.Run(new TestLibrary());
    }
}

Output:

Parsing libraries...
Parsing code...
Unhandled declaration kind: CXXDeductionGuide
  C:\Users\user\AppData\Local\Temp\tmp6CC2.tmp (line 5)
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Repeat 2 times:
--------------------------------
   at CppSharp.Parser.ClangParser+__Internal.ParseHeader(IntPtr)
--------------------------------
   at CppSharp.Parser.ClangParser.ParseHeader(CppSharp.Parser.CppParserOptions)
   at CppSharp.ClangParser.ParseSourceFiles(System.Collections.Generic.IEnumerable`1<System.String>, CppSharp.Parser.ParserOptions)
   at CppSharp.Driver.ParseCode()
   at CppSharp.ConsoleDriver.Run(CppSharp.ILibrary)
   at Program.Main(System.String[])

Second question:

How to include a precompiled header?
Because when <cassert> is included in a precompiled header I am getting:

error: use of undeclared identifier 'assert'
CppSharp has encountered an error while parsing code.