bug#35542: Installer does not display full backtrace on error

[pelzflorian (Florian Pelz)]

On Sat, May 04, 2019 at 06:14:48PM +0200, Mathieu Othacehe wrote:
> Thanks for testing Florian. Based on Danny suggestion we could set
> COLUMNS to 200 to have a more verbose backtrace (like guix itself).
> 

It works (I have applied both patches).

This is one of the longer backtrace steps:

In ice-9/eval.scm:
    619:8 17 (_ #(#(#(#<directory (guile-user) 1775140>
#<<installer> name: newt init: #<procedure init ()> exit:
#<procedure exit ()> exit-error: #<procedure exit-error (file
key args)> fi…> …)) …))