flattening fails without helpful error message

[Lennart Ochel]

I created an almost flat model out of the flat Modelica code that Dymola generates (Dymola 2014 is needed, because of impure functions).
OpenModelica seems to be unable to flatten this (already very flat) model. If I press "check model" in OMEdit I get the following message:

"Internal error! Check of: test_1 failed with no error message."

[Lennart Ochel]

I am a bit cofued about the ouput that I get. If I run omc .\test_1.mo +s +d=failtrace +locale=en Modelica then the output of the flat code stops at line 1206 of test_1.mo with the following error message: Execution failed!.
If I run omc .\test_1.mos +d=failtrace +locale=en using the following script than the output of the flat code stops one assignment later at line 1207 of test1_.mo with the following error message:
Error: Internal error SimCode: The model test_1 could not be translated

loadModel(Modelica); getErrorString();
loadFile("test_1.mo"); getErrorString();

simulate(test_1); getErrorString();

1. Can anyone explain why this two commands behave different?
2. Anyway, the error message is not that helpful. Can anyone help me to understand the issue?

[Martin Sjölund]

instantiateModel and without +s works just fine. So it is something in the backend.

[Lennart Ochel]

You are right. It was “check model” and not “instantiate model”.