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copied!<p>Just want to let you know this <em>is</em> a bug specific to C# (and @leppie I have confirmed it does fail with the standard csc.exe, not even in Visual Studio). Redundantly specifying a named argument <em>shouldn't</em> cause a change in behaviour at all.</p> <p>The bug has been reported at <a href="https://connect.microsoft.com/VisualStudio/feedback/details/678498">Microsoft Connect</a>.</p> <p>The equivalent VB works fine (because it does compile I added a little bit to confirm the runtime behaviour is as expected):</p> <pre class="lang-vb prettyprint-override"><code>Imports System Module Test Function F(Of T)(ByVal fn As Func(Of T)) As T Return fn() End Function Function Inc(ByRef i as Integer) As String i += 1 Return i.ToString End Function Sub Main() Dim s As String s = F(Of String)(Function()"Hello World.") console.writeline(s) s = F(Function()"Hello, World!") console.writeline(s) s = F(Of String)(fn:=Function()"hello world.") console.writeline(s) s = F(fn:=Function()"hello world") console.writeline(s) Dim i As Integer Dim func As Func(Of String) = Function()"hello world " & Inc(i) s = F(Of string)(func) console.writeline(s) s = F(func) console.writeline(s) s = F(Of string)(fn:=func) console.writeline(s) s = F(fn:=func) console.writeline(s) End Sub End Module </code></pre> <p>Output:</p> <pre class="lang-none prettyprint-override"><code>Hello World. Hello, World! hello world. hello world hello world 1 hello world 2 hello world 3 hello world 4 </code></pre>

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