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[API Proposal]: Add System.Runtime.CompilerServices.RefSafetyRulesAttribute #76032

@cston

Description

@cston

Background and motivation

The C# compiler emits a [module: RefSafetyRules(11)] attribute to modules compiled with -langversion:11 or above, or compiled with .NET 7 or above, to indicate that the module was compiled with C#11 ref safety rules.

The RefSafetyRulesAttribute type definition should be added to the BCL to avoid having the compiler emit the attribute definition to each module.

See RefSafetyRulesAttribute.

API Proposal

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Module, AllowMultiple = false, Inherited = false)]
    public sealed class RefSafetyRulesAttribute : Attribute
    {
        public RefSafetyRulesAttribute(int version) { Version = version; }
        public int Version;
    }
}

API Usage

The RefSafetyRulesAttribute type is for compiler use only - it is not permitted in source.

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