On 02/06/2018 09:30 AM, Noam Postavsky wrote:
> on w32 I get an assertion failure, patch attached.

On Fedora 27 x86-64 I get a crash when running 'emacs 
--no-build-details'. There are several places in the Emacs code that 
crash when Fsystem_name returns a non-string. Proposed patch attached.