dotnet/roslyn

CLR bug with static variable in struct could be warned by the compiler

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#10,126 创建于 2016年3月26日

 (27 条评论) (2 个反应) (0 位负责人)C# (4,257 个派生)batch import
Area-CompilersFeature - Warning WavesFeature Requesthelp wanted

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描述

The following code compiles, but throws a TypeLoadException when executed.

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var x = MyStruct.Empty;
        }

        public struct MyStruct
        {
            public static readonly MyStruct? Empty = null;
        }
    }
}

Since Empty is static, this is not a cyclic struct layout issue. It would be nice if the compiler produced warnings that tells you that you are likely to run into this CLR bug at runtime

[Note from @gafter this is due to CLR bug https://github.com/dotnet/coreclr/issues/4049. See also https://github.com/dotnet/coreclr/issues/7957 and https://github.com/dotnet/coreclr/issues/22553 for other situations where the warning would be helpful]

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