Equation systems in when equations not handled correctly

[Per Östlund]

Equation systems are not handled correctly when put in when equations, such as in this example model:

model when_test
    Real x;
    Real y;
equation
    when sample(0, 10) then
        x = y;
        y = x;
    end when;
end when_test;

This model gives the following error messages when compiled:

generate_ode_system2_nonlinear_residuals failed
-SimCodegen.buildSolvedBlocks failed
Error processing file: test.mo
Error: Internal error generate_compute_output failed
Error: Internal error Generation of simulation code  failed

[Lennart Ochel]

What is the expected behavior?

BTW: Error messages changed over the years. This is the current output:

Error: Internal error ./Compiler/BackEnd/BackendDAETransform.mo: function analyseStrongComponentBlock failed
Sorry - Support for Discrete Equation Systems is not yet implemented
x
y
when sample(1, 0.0, 10.0) then
  x := y
end when
when sample(1, 0.0, 10.0) then
  y := x
end when
Error: Internal error ./Compiler/BackEnd/BackendDAETransform.mo: function analyseStrongComponentBlock failed
Error: Internal error ./Compiler/BackEnd/BackendDAETransform.mo: function strongComponentsScalar failed
- sorting equations (strongComponents) failed
Error: Internal error Transformation Module sort components failed!

[Martin Sjölund]

This ticket was not closed for 1.9.1, which has now been released. It was batch modified for milestone 1.9.2 (but maybe an empty milestone was more appropriate; feel free to change it).

[Martin Sjölund]

Milestone changed to 1.9.3 since 1.9.2 was released.

[Per Östlund]

Replying to lochel:

What is the expected behavior?

I have no idea, and I don't remember why I submitted this ticket in the first place. I guess the expected behaviour is to either handle this if it can be handled somehow, or to print a good error message. At the moment it print a lot of internal errors, which isn't very userfriendly.

[Martin Sjölund]

Moved to new milestone 1.9.4

[Martin Sjölund]

Milestone pushed to 1.9.5

[Martin Sjölund]

Milestone renamed

[Martin Sjölund]

Ticket retargeted after milestone closed

[Martin Sjölund]

Milestone moved to 1.12.0 due to 1.11.0 already being released.

[Francesco Casella]

The milestone of this ticket has been reassigned to "Future".

If you think the issue is still valid and relevant for you, please select milestone 1.13.0 for back-end, code generation and run-time issues, or 2.0.0 for front-end issues.

If you are aware that the problem is no longer present, please select the milestone corresponding to the version of OMC you used to check that, and set the status to "worksforme".

In both cases, a short informative comment would be welcome.