TypeInfoExtensions.cs

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using System.Collections.Generic;
using System.Runtime.CompilerServices;
 
namespace System.Linq.Expressions.Compiler;
 
internal static class TypeInfoExtensions
{
    public static Type MakeDelegateType(this DelegateHelpers.TypeInfo info, Type retType, params Expression[] args)
    {
        return info.MakeDelegateType(retType, (IList<Expression>)args);
    }
 
    public static Type MakeDelegateType(this DelegateHelpers.TypeInfo info, Type retType, IList<Expression> args)
    {
        Type[] array = new Type[args.Count + 2];
        array[0] = typeof(CallSite);
        array[^1] = retType;
        for (int i = 0; i < args.Count; i++)
        {
            array[i + 1] = args[i].Type;
        }
        return info.DelegateType = DelegateHelpers.MakeNewDelegate(array);
    }
}