Partial model using undeclared variable in equation works with OF but not with NF

[Karim Adbdelhak]

The model M from the following package was compilable in the old but not in the new frontend:

package partialstuff

partial model PM
equation
  v = 10;
end PM;

model M
  extends PM;
  Integer v;
end M;

end partialstuff;

The error message for the NF is

[1] 09:48:59 Translation Error
[partialstuff: 5:3-5:9]: Variable v not found in scope PM.

Is this expected behaviour? Does someone know what the specification says about this?

[Per Östlund]

Yes, that's the expected behaviour, the OF handles extends incorrectly. If you try it with e.g. Dymola you'll get the same error as with the NF.

[Karim Adbdelhak]

Thanks!

[Francesco Casella]

The point of partial is to leave some behaviour (-> equations) unspecified, to be later filled in by child models.

To the contrary, writing equations with undeclared variables would be odd in a declarative language. Modelica is not Matlab :)