Hullo,

Ludovic Courtès 写道：
> Users are not supposed to see backtraces coming from the daemon 
> or its
> helpers (‘guix substitute’, ‘guix offload’, etc.).

Put that in the EULA then, because those naughty users insist on 
doing so regularly :-)  It's not clear what you're arguing for.

Pierre Neidhardt 写道：
> The COLUMN environment option (set in root's .bash_profile) does 
> not
> extend the print width of backtraces when running `guix build`.

Nor should it[0].  What you describe sounds like a convenient bug 
being fixed(?).  Was this on Guix System or a foreign 
distribution?

Yours in curiosity and frustration,

T G-R

[0]: 
https://www.gnu.org/software/bash/manual/html_node/Bash-Startup-Files.html#Bash-Startup-Files