Fixed size buffers cause an exception if they are not omitted

[scottbilas]

Given this code:

unsafe struct S
{
    fixed int F[5];
}

Running with this cli: refasmer test.dll --omit-non-api-members=false

It gives this error:

 JetBrains.Refasmer.MetadataImporter+UnknownTypeInSignature: Unknown type in signature: {TypeDef[3]: ::<F>e__FixedBuffer}
   at JetBrains.Refasmer.MetadataImporter.ImportingVisitor.VisitTypeHandle(EntityHandle srcHandle) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/SignatureImport.cs:line 41
   at JetBrains.Refasmer.MetadataImporter.AcceptTypeHandleSignature[T](BlobReader& blobReader, ISignatureVisitor`1 visitor) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/SignatureImport.cs:line 246
   at JetBrains.Refasmer.MetadataImporter.AcceptTypeSignature[T](BlobReader& blobReader, ISignatureVisitor`1 visitor) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/SignatureImport.cs:line 208
   at JetBrains.Refasmer.MetadataImporter.AcceptFieldSignature[T](BlobReader& blobReader, ISignatureVisitor`1 visitor) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/SignatureImport.cs:line 132
   at JetBrains.Refasmer.MetadataImporter.AcceptSignatureWithHeader[T](BlobHandle srcHandle, ISignatureVisitor`1 visitor) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/SignatureImport.cs:line 89
   at JetBrains.Refasmer.MetadataImporter.ImportTypeDefinitionSkeleton(TypeDefinitionHandle srcHandle, Boolean omitMembers) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/ImportLogic.cs:line 40
   at JetBrains.Refasmer.MetadataImporter.Import() in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/ImportLogic.cs:line 481
   at JetBrains.Refasmer.MetadataImporter.MakeRefasm(MetadataReader metaReader, PEReader peReader, LoggerBase logger, IImportFilter filter, Nullable`1 omitNonApiMembers, Boolean makeMock, Boolean omitReferenceAssemblyAttr) in /mnt/agent/work/810daf81501891b9/src/Refasmer/Importer/MetadataImporter.cs:line 95
   at JetBrains.Refasmer.Program.MakeRefasm(ValueTuple`2 input) in /mnt/agent/work/810daf81501891b9/src/RefasmerExe/Program.cs:line 287
   at JetBrains.Refasmer.Program.Main(String[] args) in /mnt/agent/work/810daf81501891b9/src/RefasmerExe/Program.cs:line 203
 ABORTED

I don't see how to get the version number from refasmer to tell you the release I am using, but I just installed it today using dotnet tool install -g JetBrains.Refasmer.CliTool. I did pull source and it repro'd as well with commit 7099bb9777.

[ForNeVeR]

A good point on the missing --version option, I'll add one.

What happens here I imagine is that the type for the fixed buffer is marked as [CompilerGenerated], and we have a heuristic (I think?) that skips such types during refasm generation.

Of course, this is not correct and should be fixed (pun not intended!).