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As Ahmad already commented, the logs go to the systemd journal. In order to read them, first find out the systemd unit that belongs to your session (which is a systemd unit of type "scope"). Then use that session as unit for journalctl, like this:

$ systemctl list-units -t scope
UNIT                             LOAD   ACTIVE SUB     DESCRIPTION
session-5.scope                  loaded active running Session 5 of user martin
[...]
$ journalctl -b -u session-5.scope

You could create a shortcut for this in bash, like this:

alias xsession-errors='journalctl -b -u $(systemctl -t scope | awk "/user $USER\$/ { print \$1; }")'

With this alias, you can view your logs simply by typing xsession-errors.