[Mono-dev] Gmcs compiler bug with generics

[Tom Philpot]

We found the following bug with gmcs ( r138189). I¹ll be filling a bugzilla
report as well, but thought I¹d post it here in case someone wants a head
start.

Tom

using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace TestNS
{
    public class TestCase
    {
        public static int Compare<T>(T[] array1, T[] array2)
        {
            return 0;
        }

        public static void DoSomething<T>(Func<T, T, int> fn)
        {
            Console.WriteLine(fn(default(T), default(T)));
        }

        public static void DoSomethingElse()
        {
            // Does not work
            DoSomething<byte[]>(TestCase.Compare);
            // Does work
            // DoSomething<byte[]>((a, b) => TestCase.Compare(a, b));
        }
    }
}


[ tom.philpot]$ gmcs TestCompiler.cs -out:TestCompiler.dll
Internal compiler error at TestCompiler.cs(23,36):: exception caught while
emitting MethodBuilder [TestCase::DoSomethingElse]

Unhandled Exception: Mono.CSharp.InternalErrorException:
VerifyArgumentsCompat didn't find any problem with rejected candidate Void
DoSomething[Byte[]](System.Func`3[System.Byte[],System.Byte[],System.Int32])
  at Mono.CSharp.MethodGroupExpr.OverloadResolve (Mono.CSharp.EmitContext
ec, Mono.CSharp.Arguments& Arguments, Boolean may_fail, Location loc)
[0x00000] 

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