Bug 18866 - Mono C# compiler incorrectly emits CS0221 compiler error when casting the bitwise compliment of a ushort typed enum to a ushort variable
Summary: Mono C# compiler incorrectly emits CS0221 compiler error when casting the bit...
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: All All
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2014-04-08 14:24 UTC by emoriarty
Modified: 2014-05-05 08:58 UTC (History)
2 users (show)

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

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Description emoriarty 2014-04-08 14:24:28 UTC
The mono C# compiler incorrectly emits CS0221 when casting the bitwise compliment of a ushort enum into a ushort variable. 

===== Test.cs =====
     1  class Test {
     2      public enum E : ushort
     3      {
     4          Mask = 0
     5      }
     6      public ushort foo()
     7      {      
     8          ushort Mask = (ushort)(~E.Mask);
     9          return Mask;
    10      }
    11  }
===== End of Test.cs =====

Command Lines:

From Visual Studio 2013 Command Prompt
$ csc /target:library Test.cs
Microsoft (R) Visual C# Compiler version 12.0.21005.1
for C# 5
Copyright (C) Microsoft Corporation. All rights reserved.

From Mono-3.4.0 command prompt
$ mcs /target:library Test.cs
Test.cs(8,35): error CS0221: Constant value `-1' cannot be converted to a `ushort' (use `unchecked' syntax to override)
Compilation failed: 1 error(s), 0 warnings

Other Mono Versions: fail fail fail fail fail fail

Edward Moriarty | Junior Engineer
Coverity | The Leader in Development Testing
Comment 1 Marek Safar 2014-05-05 08:58:08 UTC
Fixed in master