Examples of errors detected by the V8011 diagnostic

V8011. Identical expression to the left and to the right of compound assignment.

OpenDiablo2

V8011 Identical expression 'wg.width' to the left and to the right of compound assignment. widget_group.go 55

func (wg *WidgetGroup) adjustSize(w Widget) {
  x, y := w.GetPosition()
  width, height := w.GetSize()

  if x+width > wg.x+wg.width {
    wg.width += (x + width) - (wg.x + wg.width)     // <= (1)
  }

  if wg.x > x {
    wg.width += wg.x - x
    wg.x = x
  }

  if y+height > wg.y+wg.height {
    wg.height += (y + height) - (wg.y + wg.height)  // <= (2)
  }

  if wg.y > y {
    wg.height += wg.y - y
    wg.y = y
  }

}

Similar errors can be found in some other places:

• V8011 Identical expression 'wg.height' to the left and to the right of compound assignment. widget_group.go 64

gitea

V8011 Identical expression 'previousNum' to the left and to the right of compound assignment. paginator.go 177

func (p *Paginator) Pages() []*Page {
  ....
  previousNum := getMiddleIdx(p.numPages) - 1
  if previousNum > p.current-1 {
    previousNum -= previousNum - (p.current - 1)
  }
  ....
}

gitea

V8011 Identical expression 'm[1]' to the left and to the right of compound assignment. linkify.go 108

func (s *linkifyParser) Parse(....) ast.Node {
  ....
  if m != nil {
    lastChar := line[m[1]-1]
    if lastChar == '.' {
      m[1]--
    } else if lastChar == ')' {
      ....
    } else if lastChar == ';' {
      i := m[1] - 2
        for ; i >= m[0]; i-- {
          if util.IsAlphaNumeric(line[i]) {
            continue
          }
          break
        }
        if i != m[1]-2 {
          if line[i] == '&' {
            m[1] -= m[1] – i               // <=
          }
        }
      }
    }
  ....
}