Snakemake version
9.1.1

Describe the bug
In Snakemake 8.x the log variable, which can be accessed in onerror etc. to get the path to the Snakemake log, used to be of type string. In Snakemake 9.x it looks like the type changed to dict_values, which forces users to use something like "... {log}".format(log=next(iter(log)) instead of simply doing "... {log}" as presented in the documentation.

Logs
/usr/bin/bash: -c: line 1: syntax error near unexpected token (' /usr/bin/bash: -c: line 1: set -euo pipefail; echo dict_values(['/tools/my_software/.snakemake/log/2025-03-26T080156.150733.snakemake.log']);'

Minimal example

onerror:
    shell("echo {log}")

Now needs to be like:

onerror:
    shell("echo {log}".format(log=next(iter(log))))