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C# is (normally) an order-independent language, in that it doesn't matter what order you declare types within a file, or what order you provide files on the command-line, or what order you reference assemblies.
Created attachment 13532 [details]
Behold! A counter example appears.
Attachment #13532 [details] contains an example wherein changing the order of filenames on the command-line results in success or failure on compiler output:
> $ make works
> mcs /unsafe /t:library /out:works.dll JavaObject.cs JniObjectReference.cs JniReferenceSafeHandle.cs
> JniObjectReference.cs(7,27): warning CS0169: The private field `Java.Interop.JniObjectReference.safeHandle' is never used
> Compilation succeeded - 1 warning(s)
> $ make fails
> mcs /unsafe /t:library /out:fails.dll JniObjectReference.cs JavaObject.cs JniReferenceSafeHandle.cs
> JavaObject.cs(7,35): error CS0208: Cannot take the address of, get the size of, or declare a pointer to a managed type `Java.Interop.JniObjectReference'
> JniObjectReference.cs(5,16): (Location of the symbol related to previous error)
> Compilation failed: 1 error(s), 0 warnings
The difference between the two lines is the relationship between JniObjectReference.cs and JavaObject.cs: if JniObjectReference.cs comes *first*, it fails to compile. If it comes *after*, it succeeds.
Which, mind you, is extremely confusing and I think is the *opposite* of where I first saw this appear!
> $ mcs --version
> Mono C# compiler version 184.108.40.206
Actual behavior: Compiler error or no error depending on the ordering of filenames.
Expected behavior: The compiler should at least be consistent! :-)
Also, the code should fail to compile:
> CSC /unsafe JavaObject.cs JniObjectReference.cs JniReferenceSafeHandle.cs
> Microsoft (R) Visual C# Compiler version 4.0.30319.34209 for Microsoft (R) .NET Framework 4.5
> Copyright (C) Microsoft Corporation. All rights reserved.
> JavaObject.cs(7,59): error CS0208: Cannot take the address of, get the size of,
> or declare a pointer to a managed type
> JniObjectReference.cs(5,16): (Location of symbol related to previous error)
Fixed in master/6262c487d38ce3575ebe8f6425e63dfceb3adf96