Help and clean command line options are incompatible

[markfinal]

This is the result:

$ bam -b=VSSolution --C.toolchain=VisualC -j=0 -c --help
BuildAMation (Bam) v1.0.0 (c) Mark Final, 2010-2015. Licensed under BSD 3-clause. See License file.
Using C# compiler v4.0 with assemblies in c:\dev\BuildAMation\bin\Release

Syntax:
bam [[option[=value]]...]

Deleting build root 'C:\Users\mark\AppData\Local\Temp'
System.UnauthorizedAccessException not handled: Access to the path 'Director-655e7ac-right.cs' is denied.
at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
at Bam.Core.PackageUtilities.CompilePackageAssembly(Boolean enforceBamAssemblyVersions)
at Bam.CommandLineArgumentHelper.PrintHelp()
at Bam.Program.Main(String[] args)

[markfinal]

Specifically, this is when --help -c is invoked in a package directory.