[Mono-bugs] [Bug 661984] New: Compiler crashes (InternalErrorException -> ArgumentException) in a "very special case"

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https://bugzilla.novell.com/show_bug.cgi?id=661984

https://bugzilla.novell.com/show_bug.cgi?id=661984#c0


           Summary: Compiler crashes (InternalErrorException ->
                    ArgumentException) in a "very special case"
    Classification: Mono
           Product: Mono: Compilers
           Version: 2.8.x
          Platform: All
        OS/Version: SLED 11
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: msafar at novell.com
        ReportedBy: mirapalheta at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US)
AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.224 Safari/534.10

Compiler crashes when trying to build a class witch descend from another which
as a "auto-related" generic parameter. This only happens when the descendant
class overrides a Parent method. Sorry I couldn't explain better, please see
the code bellow so you'll find out what I mean.

Reproducible: Always

Steps to Reproduce:
1. Build the following code:

using System;
using System.Linq;
using System.Linq.Expressions;

namespace BuildTest
{
    class Dummy<T> {}
    abstract class GranParent<T>
    {        
        public virtual Dummy<T1> Test<T1>(Expression<Func<T, T1>> p)
        {
            return new Dummy<T1>();
        }
    }
    abstract class Parent<T, P> : GranParent<T>
        where P : Parent<T, P>
    {
    }
    class Child<T> : Parent<T, Child<T>>
    {
        public override Dummy<T1> Test<T1>(Expression<Func<T, T1>> p)
        {
            return base.Test<T1>(p);
        }
    }
}

--- Compiler outputs:

Unhandled Exception: Mono.CSharp.InternalErrorException:
/home/mira/develop/test/BuildTest/Main.cs(19,15): BuildTest.Child<T> --->
Mono.CSharp.InternalErrorException:
/home/mira/develop/test/BuildTest/Main.cs(21,43):
BuildTest.Child<T>.Test<T1>(System.Linq.Expressions.Expression<System.Func<T,T1>>)
---> System.ArgumentException: Invalid arguments

2-a. If the class Child doesn't override the method the compiler does fine.

2-b. If the class Child is changed to "class Child<T> : GranParent<T>" the
compiler does fine.

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