[Mono-bugs] [Bug 691061] New: mcs fails to report CS0201 for lambda for void return delegate & parenthesized expression

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=691061

https://bugzilla.novell.com/show_bug.cgi?id=691061#c0


           Summary: mcs fails to report CS0201 for lambda for void return
                    delegate & parenthesized expression
    Classification: Mono
           Product: Mono: Compilers
           Version: SVN
          Platform: Other
        OS/Version: openSUSE 11.4
            Status: NEW
          Severity: Minor
          Priority: P5 - None
         Component: C#
        AssignedTo: msafar at novell.com
        ReportedBy: aenomoto at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


The following example shows that
  the lambda expression
    that takes a delegate
      whose return value is void
  fails to reject parenthesized expression:

$ cat x.cs
using System;

public class X
{
        static Action<int> x;

        public static void Main ()
        {
                string s = null;
                x = i => (s = "ABCDE".Substring (0, i));
                x (3);
                Console.WriteLine (s);
        }
}


atsushi at monkeytimeline2 ~/tests
$ mcs x.cs

atsushi at monkeytimeline2 ~/tests
$ csc x.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.

x.cs(10,12): error CS0201: Only assignment, call, increment, decrement, and new
        object expressions can be used as a statement


If it is not Action but Func (i.e. with some return value) .NET also does not
reject such a parenthesized expression. I'm not sure which behavior is
conformant to ECMA C# specification.

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