I use an `Inc()` function in a diagram and this works, but if I use it as argument of a procedure() then it is increase 2 times.
Details see below (I use current plantuml server, v 1.2020.23beta3)
Does somebody knows a solution?
Thank you and best regards
Helmut
```
@startuml
!$lastIndex = 0
!$index = 1
!function Inc()
!$lastIndex = $index
!$index = $lastIndex + 1
!return $lastIndex
!endfunction
!unquoted procedure Rel_($e_index, $alias1, $alias2, $label, $direction="")
$alias1 $direction $alias2 : **$e_index: $label**
!endprocedure
!unquoted procedure RelIndex($e_index, $from, $to, $label)
$from -->>$to : **$e_index: $label**
!endprocedure
' 1 2 3
Inc() -->> Inc() : Inc()
' 4
RelIndex(Inc(), A, B, "Should be 4")
' 5
RelIndex(Inc(), A, B, "Should be 5")
@enduml
```