[hubertus65]

Modelica.ComplexBlocks.Routing.Extractor sets its protected Complex selection vector k in a when-equation:

when {initial(),change(index)} then
  for i in 1:nin loop
    k[i] = if index == i then Complex(1,0) else Complex(0,0);
  end for;
end when;

OpenModelica 1.27.1 cannot generate code for a record assignment inside a when-equation, so no model that uses Extractor builds:

Error: Template error: No runtime support for this record assignment: extractor2.k[1] = if extractor2.index == 1 then Complex(1.0, 0.0) else Complex(0.0, 0.0).

The error is not specific to the if-expression. k[i] = Complex(if index == i then 1 else 0, 0) fails the same way. This PR assigns the two Real fields instead, which OpenModelica supports:

    k[i].re = if index == i then 1 else 0;
    k[i].im = 0;

Verification

Test: Extractor with nin=3, driven by an IntegerStep index from 1 to 3 (and out of range with allowOutOfRange=true) at t = 0.5.

Tool	Before	After
OpenModelica 1.27.1	code generation error (above)	simulates; matches OCT within 1e-15, except at the event instant itself
OCT (Modelon Impact)	simulates	simulates; same final values

The OCT "after" result was produced with a copy of the changed block, since Impact ships its own MSL. The test model is part of the ModelicaTest coverage work on branch coverage-improvement.

🤖 Generated with Claude Code

https://claude.ai/code/session_01UmNZkRw6HV9CeBvNk36AzT