Messages with a severity level greater than or equal to level will be displayed.
Default is warn_level.
See unknown_level, fatal_level, error_level`,warn_level,
info_levelanddebug_level`.
# Severity threshold
#
# Messages with a severity level greater than or equal to `level` will be displayed.
# Default is `warn_level`.
#
# See `unknown_level`, `fatal_level`, error_level``, `warn_level`,
# `info_level` and `debug_level`.
var level: Int = warn_level is optional, writable
lib/logger/logger.nit:134,2--141,50