[Mono-bugs] [Bug 506757] New: CS0507 when overriding public method in class generated by ikvmc

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http://bugzilla.novell.com/show_bug.cgi?id=506757


           Summary: CS0507 when overriding public method in class
                    generated by ikvmc
    Classification: Mono
           Product: Mono: Compilers
           Version: 2.4.x
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: jeroen at sumatra.nl
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=294098)
 --> (http://bugzilla.novell.com/attachment.cgi?id=294098)
IL source

User-Agent:       Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64;
Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322;
NET CLR 3.5.30729; InfoPath.2; .NET CLR 3.0.30729; .NET CLR 4.0.20506)

In Java it is legal to widen access when overriding a method, so ikvmc can
generate assemblies that contain classes that do this.

When mcs encounters a C# class that overrides a public method (with a public
method) it should accept this instead of considering the protected method in
some base class.

See attached repro. Note that the repro contains an intermediate class
(__WorkaroundBaseClass__.test) that is a workaround for a related bug in csc,
but this workaround doesn't work (or affect) the problem with mcs.

Note that this is a showstopper for IKVM compilation on Mono, because the Sun
AWT toolkit uses this construct.

Reproducible: Always

Steps to Reproduce:
1. ilasm /dll test.il
2. mcs test.cs -r:test.dll 

Actual Results:  
test.cs(11,24): error CS0507: `test1.foo()': cannot change access modifiers
when
 overriding `protected internal' inherited member
`__WorkaroundBaseClass__.test.
foo()'

Expected Results:  
Successful compile.

test.cs:

public class test1 : test
{
  public override void foo() { }
}

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