Bug 13289 - CS0314 with partial classes and constraints (REGRESSION) - order of input files matters
Summary: CS0314 with partial classes and constraints (REGRESSION) - order of input fil...
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2013-07-17 07:14 UTC by Ole Hyldahl Tolshave
Modified: 2013-07-18 14:55 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

ZIP-archive containing 3 C#-files. (622 bytes, application/x-zip-compressed)
2013-07-17 07:14 UTC, Ole Hyldahl Tolshave

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Description Ole Hyldahl Tolshave 2013-07-17 07:14:16 UTC
Created attachment 4356 [details]
ZIP-archive containing 3 C#-files.

I have a quite complictaed class system with a lot of partial classes and generic parameter constraints.

The library fails to compile with mono 3.1.2, but compiles just fine on 2.10.9 (and Visual Studio 2012).

I have isolated the attached test case with consists only 3 files. 

How to reproduce:
Unzip the attached zip file and build with:
$ mcs BD.cs Program.cs GPD.cs /out:Test.exe

What happens (on mono 3.1.2):
MCS fails with this error:
GPD.cs(5,30): error CS0314: The type `T2' cannot be used as type parameter `T' in the generic type or method `PC<T>'. There is no boxing or type parameter conversion from `T2' to `PD'
Program.cs(10,17): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

What should have happened (and does happen with 2.10.9);
The program builds and when executed simply prints "Done".

When changing the build command to (order of input files changed):
mcs Program.cs BD.cs GPD.cs /out:Test.exe 

then 3.1.2 builds fine. I tried changing the order of the input files on 2.10.9, but 2.10.9 appears to be working with any order.
Comment 1 Marek Safar 2013-07-18 05:01:30 UTC
Fixed in master.

Nice test case, thanks for the effort.
Comment 2 Ole Hyldahl Tolshave 2013-07-18 14:55:12 UTC
Thank you for your swift response. I can confirm that the fix does indeed work for the attached test case.

However, I have created a new bug 13324 that is probably related.