don't rescue/log process exit or failure exceptions: SystemExit, SystemStackError, NoMemoryError, SecurityError, SignalException

[ColinDKelley]

listen currently rescues Exception but this includes exceptions that indicate process exit or failure. For example, as reported in #532 by @RobinDaugherty:

Using Guard with listen, when Guard is notified by listen that the Guardfile changed, Guard calls exit.

This results in the following alarming output:

E, [2021-03-09T10:48:09.258474 #79158] ERROR -- : Exception rescued in _process_changes:
SystemExit: exit
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/guard-2.16.2/lib/guard.rb:166:in `exit'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/guard-2.16.2/lib/guard.rb:166:in `_guardfile_deprecated_check'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/guard-2.16.2/lib/guard.rb:121:in `block in _listener_callback'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/config.rb:28:in `call'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/processor.rb:117:in `block in _process_changes'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/thread.rb:26:in `rescue_and_log'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/processor.rb:116:in `_process_changes'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/processor.rb:25:in `block in loop_for'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/processor.rb:20:in `loop'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/processor.rb:20:in `loop_for'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/loop.rb:85:in `_process_changes'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/event/loop.rb:51:in `block in start'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/thread.rb:26:in `rescue_and_log'
/opt/rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/listen-3.4.1/lib/listen/thread.rb:18:in `block in new'

To address this, listen should simply rescue StandardError (the default for rescue).

[ColinDKelley]

Fixed by #535 in v3.5.0