id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
5029	Initial equations involving records are not handled correctly by the NF	Francesco Casella	Per Östlund	"Consider the following test model
{{{
model TestRecordParameter
  record R
    Real x;
    Real y;
  end R;
  
  parameter R r1(x = 3, y = 2);
  parameter R r2 = r1;

end TestRecordParameter;
}}}
the NF correctly flattens it to
{{{
class TestRecordParameter
  parameter Real r1.x = 3.0;
  parameter Real r1.y = 2.0;
  parameter Real r2.x(fixed = false);
  parameter Real r2.y(fixed = false);
initial equation
  r2 = r1;
end TestRecordParameter;
}}}
but then the back-end fails to split the initial equation into its constituents
{{{
Initial Equations (1, 2) 
======================================== 
1/1 (2): r2 = r1   [dynamic |0|0|0|0|] 
}}}
ultimately leading to C-code compilation failure.

If I now try
{{{
model TestRecordParameter2
  record R
    Real x;
    Real y;
  end R;
  
  parameter R r1(x = 3, y = 2);
  parameter R r2(x(fixed = false), y(fixed = false));
initial equation
  r2 = r1;
end TestRecordParameter2;
}}}
with the NF, I end up exactly in the same situation, while with the old FE
{{{-d=optdaedump}}} reports
{{{
Initial Equations (2, 2) 
======================================== 
1/1 (1): r2.x = r1.x   [initial |0|0|0|0|] 
2/2 (1): r2.y = r1.y   [initial |0|0|0|0|] 
}}}

and the model simulats correctly. Apparently, there is something wrong in the way the NF is passing initial equations involving parameter records to the backend.

Among others, this issue affects all the 12 {{{Modelica.Thermal.FluidHeatFlow}}} models, see e.g. [https://libraries.openmodelica.org/branches/newInst/Modelica_trunk/files/Modelica_trunk_Modelica.Thermal.FluidHeatFlow.Examples.OneMass.err Modelica.Thermal.FluidHeatFlow.Examples.OneMass]"	defect	closed	high	2.0.0	New Instantiation		fixed