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Created attachment 13277 [details]
Test file showing problem.
MCS incorrectly outputs CS0019 when comparing a reference against (null) in brackets.
See the attached test file with the following lines:
Wibble w = new Wibble();
if (w == (null)) ...
$ mcs test.cs
test.cs(6,9): error CS0019: Operator `==' cannot be applied to operands of type `Wibble' and `null'
Compilation failed: 1 error(s), 0 warnings
Without the brackets around the null the code compiles without any error.
Obviously this test case is the smallest example I could produce and is easily modified to compile.
But the real life situation is a bit more complicated and involves generated code so it is a little tricky to 'just remove the brackets', but if this issue could be fixed, that would be great. Thanks.
OS: Mac OS-X 10.10.5
Mono: Mono JIT compiler version 4.0.4
MCS: Mono C# compiler version 126.96.36.199
Created attachment 13278 [details]
Attachment with text/plain mime format
Fixed in master