rules:
  - id: odd-compound-expression
    patterns:
        - pattern-either:
              - pattern: $X += $X + $Y
              - pattern: $X += $X - $Y
              - pattern: $X -= $X + $Y
              - pattern: $X -= $X - $Y
    message: "Odd compound += or -= expression"
    languages: [go]
    severity: ERROR