Examples of errors detected by the V8011 diagnostic

V8011. An identical expression to the left and to the right of a 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               // <=
          }
        }
      }
    }
  ....
}