pint.error --no-color lint --min-severity=xxx rules
! stdout .
cmp stderr stderr.txt

-- stderr.txt --
level=fatal msg="Fatal error" error="invalid --min-severity value: unknown severity: xxx"
-- rules/0001.yml --
groups:
- name: foo
  rules:
  - alert: foo
    expr: rate(errors[2m]) > 0
    annotations:
      summary: 'error rate: {{ $value }}'
