Roslyn: Invalid image when compiling this project, caused by use of the elvis operator ?.

Created on 12 Jul 2016 · 1Comment · Source: dotnet/roslyn

Version Used: VS2015.3 RTM
CSC Version: Microsoft (R) Visual C# Compiler version 1.3.1.60616

Steps to Reproduce:

git clone -b crash-sample https://github.com/jtheisen/moldinium.git
msbuild
peverify ConsoleApplication1.exe

Expected Behavior:

All Classes and Methods in ConsoleApplication1\bin\Debug\ConsoleApplication1.exe Verified.

Actual Behavior:

[IL]: Error: [C:\Source\Repos\moldinium\ConsoleApplication1\bin\Debug\ConsoleApplication1.exe : IronStone.Moldinium.LiveList+<>c__DisplayClass10_0`1[TSource]::b__2][offset 0x0000013B] Unable to resolve token.

If you remove all the ?. operators from the Select.cs file, the program passes PEVerify.

This happens if you build in debug or release configurations.

Most helpful comment

Here is a minimal repro:

``` c#
using System;

public static class LiveList
{
struct WhereInfo
{
public int Key { get; set; }
}

public static void Where<TSource>()
{
    Action subscribe = () =>
    {
        WhereInfo<TSource>? previous = null;

        var previousKey = previous?.Key;
    };
}

public static void Main()
{
}

}
```

svick on 12 Jul 2016

👍4

>All comments

Here is a minimal repro:

``` c#
using System;

public static class LiveList
{
struct WhereInfo
{
public int Key { get; set; }
}

public static void Where<TSource>()
{
    Action subscribe = () =>
    {
        WhereInfo<TSource>? previous = null;

        var previousKey = previous?.Key;
    };
}

public static void Main()
{
}

}
```

svick on 12 Jul 2016

👍4

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