public static IEnumerable<TSource> Trace<TSource>(
	this IEnumerable<TSource> source,
	Func<TSource, string> formatter
)

<ExtensionAttribute>
Public Shared Function Trace(Of TSource) ( 
	source As IEnumerable(Of TSource),
	formatter As Func(Of TSource, String)
) As IEnumerable(Of TSource)

public:
[ExtensionAttribute]
generic<typename TSource>
static IEnumerable<TSource>^ Trace(
	IEnumerable<TSource>^ source, 
	Func<TSource, String^>^ formatter
)

[<ExtensionAttribute>]
static member Trace : 
        source : IEnumerable<'TSource> * 
        formatter : Func<'TSource, string> -> IEnumerable<'TSource>