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using System;
using System.Linq;
 
public class Test
{
	static void Main()
	{
	    var x = Enumerable.Range(0, 1).Sum(a);
	}
 
	private static int a(int a)
	{
	    return Enumerable.Range(0, 1).Sum(b);
	}
	private static int b(int b)
	{
	    return Enumerable.Range(0, 1).Sum(c);
	}
	private static int c(int c)
	{
	    return Enumerable.Range(0, 1).Sum(d);
	}
	private static int d(int d)
	{
	    return Enumerable.Range(0, 1).Sum(e);
	}
	private static int e(int e)
	{
	    return Enumerable.Range(0, 1).Sum(f);
	}
	private static int f(int f)
	{
	    return Enumerable.Range(0, 1).Count(g);
	}
	private static bool g(int g)
	{
	    return true;
	}
}

prog.cs(8,44): error CS0121: The call is ambiguous between the following methods or properties: `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int>)' and `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int?>)'
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
prog.cs(13,43): error CS0121: The call is ambiguous between the following methods or properties: `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int>)' and `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int?>)'
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
prog.cs(17,43): error CS0121: The call is ambiguous between the following methods or properties: `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int>)' and `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int?>)'
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
prog.cs(21,43): error CS0121: The call is ambiguous between the following methods or properties: `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int>)' and `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int?>)'
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
prog.cs(25,43): error CS0121: The call is ambiguous between the following methods or properties: `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int>)' and `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int?>)'
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
prog.cs(29,43): error CS0121: The call is ambiguous between the following methods or properties: `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int>)' and `System.Linq.Enumerable.Sum<int>(this System.Collections.Generic.IEnumerable<int>, System.Func<int,int?>)'
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
Compilation failed: 6 error(s), 0 warnings

Standard output is empty