code: func (v *evalVisitor) popBlockParams() map[string]interface{} {
  	var result map[string]interface{}
  
  	if len(v.blockParams) == 0 {
  		return result
  	}
  
  	result, v.blockParams = v.blockParams[len(v.blockParams)-1], v.blockParams[:len(v.blockParams)-1]
  	return result
  }
docs: // popBlockParams pops last block params from stack