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using System;
using System.Collections.Generic;
 
public class Test
{
	public static void Main()
	{
		string x = "";
		Wrapper<string> xx = x;
 
		string[] y = new[] { "" };
		Wrapper<IEnumerable<string>> yy = y;
 
		IEnumerable<string> z = new[] { "" };
		Wrapper<IEnumerable<string>> zz = z;
	}
}
 
public sealed class Wrapper<T>
{
	private readonly object _value;
    public Wrapper(T value) {
    	this._value = value;
    }
    public static implicit operator Wrapper<T>(T val) { return new Wrapper<T>(val); }
}

prog.cs(15,37): error CS0029: Cannot implicitly convert type `System.Collections.Generic.IEnumerable<string>' to `Wrapper<System.Collections.Generic.IEnumerable<string>>'
Compilation failed: 1 error(s), 0 warnings

Standard output is empty