Lesser Known CLR Custom Attributes -- UnsafeValueType

In a comment to the previous post about CLR Custom Attributes I listed some other custom attributes that the CLR recognizes (by name). Some of them I previously thought were compiler only custom attributes, so I decided to investigate them.

System.Runtime.CompilerServices.UnsafeValueTypeAttribute

The documentation for this attribute, somewhat uncharacteristically, actually explains what it does, but I decided to try it out.

Here's an example that demonstrates what it does:

using System;

using System.Runtime.CompilerServices;

//[UnsafeValueType]

struct Foo {

  public int field;

}

class Program {

  [MethodImpl(MethodImplOptions.NoOptimization)]

  static void Main() {

    int i = 1234;

    Foo foo = new Foo();

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