rules:
  - id: bad-nil-guard
    patterns:
      - pattern-either:
          - pattern: $X == nil && <... $X.$F ...>
          - pattern: $X != nil || <... $X.$F ...>
          - pattern: <... $X.$F ...> && $X != nil
          - pattern: <... $X.$F ...> || $X == nil
          - pattern: <... $X.$F ...> && $X == nil
          - pattern: <... $X.$F ...> || $X != nil
    message: Bad nil guard
    languages:
      - go
    severity: ERROR
    metadata:
      license: MIT