Compilation error

When on `.NET SDK 6.0.100-preview.7.21359.1`

```
error CS0121: The call is ambiguous between the following methods or properties: 'System.Linq.Enumerable.Select<TSource, TResult>(System.Collections.Generic.IEnumerable<TSource>, System.Func<TSource, TResult>)' and 'Internal.CommandLine.Enumerable.Select<T, U>(System.Collections.Generic.IEnumerable<T>, System.Func<T, U>)'
```

This is code from here
https://github.com/dotnet/runtime/blob/6b6310b1c96457a2950c526dd1e46ed055343de2/src/coreclr/tools/Common/CommandLine/Enumerable.cs#L21-L29
and here
https://github.com/dotnet/runtime/blob/6b6310b1c96457a2950c526dd1e46ed055343de2/src/coreclr/tools/Common/CommandLine/Enumerable.cs#L42-L45

	public static IEnumerable<U> Select<T, U>(this IEnumerable<T> values, Func<T, U> func)
	{
	Debug.Assert(values != null);

	foreach (T value in values)
	{
	yield return func(value);
	}
	}

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Compilation error #55855

kant2002
openedon Jul 16, 2021

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	public static IEnumerable<T> Concat<T>(this IEnumerable<T> first, IEnumerable<T> second)
	{
	return Linq.Enumerable.Concat(first, second);
	}

Compilation error #55855

Description

kant2002openedon Jul 16, 2021

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