Version Used:

Microsoft .NET Core SDK 3.1.100 (x64)
Microsoft Visual Studio Community 2019 16.4.2

Steps to Reproduce:

Build the attached project FailedToEmitModule.zip
, or:

1. Create a new .NET Core console app
2. Add <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.2" /> to the .csproj file
3. Copy the following into Program.cs:

using System;
using Microsoft.Extensions.DependencyInjection;

namespace FailedToEmitModule
{
    public static class Program
    {
        public static void Main()
        {
            IServiceProvider serviceProvider = null;
            var foo = serviceProvider.GetService<>().Foo();
        }
    }
}

4. Build the project

Expected Behavior:

Build error along the lines of:

Program.cs(11,8,11,44): error CS7003: Unexpected use of an unbound generic name

This behaviour can be observed by removing the call to Foo().

Actual Behavior:

Build error:

CSC : error CS7038: Failed to emit module 'FailedToEmitModule'