Rustc thinks there's a cyclic import in lib

I'm trying to get 'rustc -shared lib/std.rc' to work. Currently it's blocked on thinking that 'sbuf' in lib/linux_os.rs is a cyclic import. What it does is resolve to _str.sbuf, which is itself an import of _str.rustrt.sbuf. Somehow rustc is not figuring this out, thinks the import is cyclic.
