compiler wrongly claims simple system as structurally singular

[Peter Junglas]

Running the attached system testGear2 with two inertias on both sides of a switched gear leads to internal errors. The structurally identical systems testGear3 and testGear4 work though.

[Peter Junglas]

additional test files

[Martin Sjölund]

I think the error-message that said it was structurally singular is just an error caused by the real problem: Some equation could not be symbolically differentiated. I did not have a closer look though.

[Martin Sjölund]

Jens, can you have a closer look?

    when initial() then
      tableID=tableInit(if tableOnFile then tableName else "NoName",
                        if tableOnFile then fileName else "NoName", table, smoothness);
    end when;

is selected for differentiation by dummy derivatives, which seems very silly:
1) It's discrete, so the derivative is always 0
2) It's an initial equation

[Jens Frenkel]

• index reduction works now in 10866 but simulation fails (no idea why)

[Martin Sjölund]

Was working when I tested it in trunk (r15922)