Use IL to achieve AOT visibility

Author: sakno

src/DotNext/Runtime/BoxedValue.cs

@@ -1,6 +1,10 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
+using static InlineIL.IL;
+using static InlineIL.IL.Emit;
+using static InlineIL.MethodRef;
+using static InlineIL.TypeRef;
 
 namespace DotNext.Runtime;
 
@@ -25,13 +29,6 @@ namespace DotNext.Runtime;
     where T : struct
 {
     private T value;
-
-    static BoxedValue()
-    {
-        // AOT: instantiate the class to make instance members visible to AOT
-        var boxed = new BoxedValue<T>();
-        GC.KeepAlive(boxed);
-    }
 
     [ExcludeFromCodeCoverage]
     private BoxedValue()
@@ -66,15 +63,22 @@ private BoxedValue()
     /// </summary>
     /// <param name="value">The value to be boxed.</param>
     /// <returns>A boxed representation of the value.</returns>
-    public static BoxedValue<T> Box(T value) => Unsafe.As<BoxedValue<T>>(value);
+    public static BoxedValue<T> Box(T value)
+    {
+        Push(value);
+        Box<T>();
+        Dup();
+        Call(Constructor(Type<BoxedValue<T>>()));
+        return Return<BoxedValue<T>>();
+    }
 
     /// <summary>
     /// Boxes nullable value type to an object.
     /// </summary>
     /// <param name="value">The value to be boxed.</param>
     /// <returns>A boxed representation of the value.</returns>
     [return: NotNullIfNotNull(nameof(value))]
-    public static BoxedValue<T>? TryBox(in T? value) => Unsafe.As<BoxedValue<T>?>(value);
+    public static BoxedValue<T>? TryBox(in T? value) => value.HasValue ? Box(value.GetValueOrDefault()) : null;
 
     /// <summary>
     /// Unboxes the value.