Lambda Generated Main Fails To Compile With Ambiguous Call Error

[grochoge]

Describe the bug

Trying to upgrade a .NET Lambda from Core 3.1 to 8.0 AOT. It takes no input and produces no output (it's just being used as a scheduled task).

I added a [assembly: LambdaGlobalProperties( GenerateMain = true )] attribute and added a [LambdaFunction] attribute to my function handler method, but compiling now gives error CS0121.

Note that the generated Program.g.cs is immediately deleted so I'm not able to examine it.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

Lambda generated main compiles

Current Behavior

Error (active) CS0121 The call is ambiguous between the following methods or properties: 'LambdaBootstrapBuilder.Create<TInput>(Func<TInput, Task>, ILambdaSerializer)' and 'LambdaBootstrapBuilder.Create<TOutput>(Func<Stream, TOutput>, ILambdaSerializer)' PROJECT PROJECTPATH\obj\Release\net8.0\Amazon.Lambda.Annotations.SourceGenerator\Amazon.Lambda.Annotations.SourceGenerator.Generator\Program.g.cs 25

Reproduction Steps

using System.Linq;
using System.Threading.Tasks;

using Amazon.EC2;
using Amazon.EC2.Model;
using Amazon.Lambda.Annotations;
using Amazon.Lambda.Core;

// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
[assembly: LambdaSerializer( typeof( Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer ) )]
[assembly: LambdaGlobalProperties( GenerateMain = true )]

namespace  NAMESPACE
{
    public class Function : IDisposable
    {
        /// <summary>
        /// AWS EC2 API client
        /// </summary>
        private IAmazonEC2 EC2 { get; }

        /// <summary>
        /// Default contructor
        /// </summary>
        public Function()
        {
            EC2 = new AmazonEC2Client(  );
        }

        /// <summary>
        /// Dispose this object
        /// </summary>
        public void Dispose()
        {
            EC2.Dispose();
            return;
        }

        [LambdaFunction]
        public async Task FunctionHandler()
        {
            try
            {
                Logger.LogInfo( $"Function handler invoked at {DateTime.UtcNow.ToString("o")}" );
                await Task.Delay( 50 );
                Logger.LogInfo( $"Function handler finished at {DateTime.UtcNow.ToString("o")}" );
            }
            catch(Exception lEx)
            {
                Logger.LogError( $"Caught exception {lEx.Message}, stack trace : {lEx.StackTrace}" );
            }
        }
}

Possible Solution

No response

Additional Information/Context

No response

AWS .NET SDK and/or Package version used

    <PackageReference Include="Amazon.Lambda.Annotations" Version="1.6.2" />
    <PackageReference Include="Amazon.Lambda.Core" Version="2.5.0" />
    <PackageReference Include="Amazon.Lambda.RuntimeSupport" Version="1.12.2" />
    <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.4.4" />
    <PackageReference Include="AWSSDK.CloudFormation" Version="3.7.401.11" />
    <PackageReference Include="AWSSDK.EC2" Version="3.7.425" />
    <PackageReference Include="AWSSDK.S3" Version="3.7.410.6" />
    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />

Targeted .NET Platform

.NET 8.,0

Operating System and version

Compiling on Windows 10

[normj]

I can reproduce the issue. Looking into what is happening.