Subject: [PATCH 1/?] gnu: rust: Add 1.40

From: John Soo <[email-masked]>
Date: Tue, 30 Jun 2020 23:14:09 -0700

Hello Jakub and Guix,

I can provide some feedback n this patch set.  I have been using rustc and cargo at 1.44 without issue for two weeks using these patches. I also set 1.44 as the default rust without breakages on x86. 

Hope that helps and thanks for the patches!

- John