Subject: [bug#35126] [PATCH] gnu: rust: Enable parallel tests starting with 1.26.

From: Danny Milosavljevic <[email-masked]>
Date: Fri, 5 Apr 2019 16:11:07 +0200

All tests of all Rust >= 1.26 just successfully completed--with parallel tests.

Should we limit the number of parallel jobs?  I think at least armhf is going
to be very overloaded otherwise.  To which value?