Parsing error with tuple in set comprehension

[maxime.g...@gmail.com]

Hello everyone,

I'm having a parsing error when trying to run a small B example wrote by my professor. The following

set comprehension fails to parse on my Linux system:

PROPERTIES

  ...

  & lambda_closure = closure1({ (q1,q2) | (q1,lambda,q2) : delta}) \/ id(Q)

Identifier expected
 ### File: /mnt/documents/Download/determination.mch
 ### Line: 13, Column: 32

Column 32 being the opening parenthesis in {(q1,q2) | (q1,lambda,q2) : delta}

The example worked fine on his macos computer, iirc.

I tried to run it using ProB 1.6.1, 1.7.0 and the nightly, without success.

Is this working as expected, or is this a bug? When I remove the parenthesis around (q1,q2),

the example parse and run correctly.

Here's my system:

Debugging mode: On :19
ProB Command Line Interface
  VERSION 1.7.0-final (e6c0bb3b0c68c2728b8d797c3e9eb8d140c50ab6)
  Mon Jul 10 15:09:21 2017 +0200
  Prolog: SICStus 4.3.3 (x86_64-linux-glibc2.17): Tue Jun  7 01:18:05 PDT 2016
  Application Path: /home/mgoyette/opt/ProB
  Java Runtime: /usr/bin/java
  Java Version: openjdk full version "1.8.0_144-b01"
  Java Parser: 2017-07-06 10:34:07.523
% ProB Finished

Thanks for your time,

Maxime G.

[Michael Leuschel]

Hello Maxime,

thanks for your message.

The new behaviour is indeed working as expected: Atelier-B does not allow parentheses at that part of the set comprehension.

It reports "Unexpected expression with parenthesis”.

Within Event-B / Rodin this notation is allowed (and ProB accepts it), but not within classical B.

We decided to conform to Atelier-B’s syntax and now throw a parse error.

The solution is not to use parentheses, as you found out.

Kind regards,

Michael Leuschel

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[maxime.g...@gmail.com]

Hello Michael,

Thank you for the clarification.

My professor is probably using an old version of ProB then. I will share with him this thread, so he can update his examples.

Thank you (and everyone working on ProB) for your awesome work,

Maxime G.