Sequence diagram: Double headed arrow not possible in input/output

Question

Hi,

there seems to be an inconsistency in the input language for sequence diagrams.

In messages between participants, double headed arrows (A<->B) are possible.

In input or output messages, the following results in a syntax error: [<->A.

Please consider fixing this.

Kind regards,

Uwe

 

@startuml
'this works
A<->B: One
->A: Two
[<-A: Two-1
<-A: Three
[->A: Three-1
'this breaks
<->A
[<->A
@enduml

Answer 1

With the version of 25-05-2013 (7968) I get the error message.

I just tested it with version 1.2018.09beta6 and it looks like it is working, I didn't get an error and I get an, in my opinion correct. image.

I think the problem has been solved in the mean time.

(I didn't succeed to add the image as I was not able to add the file but you can anyway see it in the online server).