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Bug 8414 - Mono MCS cannot distinguish between calls to Task.Run with and without generic types
: Mono MCS cannot distinguish between calls to Task.Run with and without generi...
Status: RESOLVED FIXED
Product: Compilers
Classification: Mono
Component: C#
: unspecified
: PC Windows
: --- normal
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Assigned To: Marek Safar
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Reported: 2012-11-14 21:07 EST by Brett van Swelm
Modified: 2012-11-16 07:59 EST (History)
1 user (show)

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Description Brett van Swelm 2012-11-14 21:07:04 EST
Mono MCS cannot distinguish between calls to Task.Run with and without generic
types.

With "D:\Applications\Mono-2.11.4\bin" and
"C:\Windows\Microsoft.NET\Framework\v4.0.30319" in the path on my Windows 7
machine:

===== AmbiguousGeneric.cs =====
using System;
using System.Threading;
using System.Threading.Tasks;

public class Something<T> {}

public class AmbiguousGeneric {
    public async void NestedVoidTestSuccess()
    {
        await Task.Run(async () => await ReturnOne());
    }
    private static Task<int> ReturnOne() {
        return Task.Run(() => 1);
    }
    public static void Main(String[] args) {}
} 
===== end =====

$ csc AmbiguousGeneric.cs
Microsoft (R) Visual C# Compiler version 4.0.30319.17929
for Microsoft (R) .NET Framework 4.5
Copyright (C) Microsoft Corporation. All rights reserved.

$ mcs AmbiguousGeneric.cs
AmbiguousGeneric.cs(10,20): error CS0121: The call is ambiguous between the
following methods or properties:
`System.Threading.Tasks.Task.Run(System.Func<System.Threading.Tasks.Task>)' and
`System.Threading.Tasks.Task.Run<System.Threading.Tasks.Task<int>>(System.Func<System.Threading.Tasks.Task<int>>)'
D:\Applications\Mono-2.11.4\lib\mono\4.5\mscorlib.dll (Location of the symbol
related to previous error)
Compilation failed: 1 error(s), 0 warnings

Thanks,

Brett van Swelm | Senior Engineer
Coverity | 185 Berry Street | Suite 6500, Lobby 3 | San Francisco, CA 94107
The Leader in Development Testing
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Comment 1 Marek Safar 2012-11-16 07:59:28 EST
Fixed in master

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