Short class definition with redeclared function fails with no error message

[Per Östlund]

The following model fails with no error message:

partial function part_func
  input Real x;
  output Real y;
end part_func;

function func1
  extends part_func;
algorithm
  y := x;
end func1;

function func2
  extends part_func;
algorithm
  y := 2 * x;
end func2;

model model1
  replaceable function func = part_func;
  Real x;
  Real y;
equation
  x = func(y);
end model1;

model model2 = model1(replaceable function func = func1);
model model3 = model2(replaceable function func = func2);

model model4
  model2 m2;
  model3 m3;
end model4;

This bug might be related to bug #1430. The model is almost the same, the only difference is that model3 extends from model2 instead of model1. I'm not 100% certain that this type of model is allowed, but regardless of whether it's allowed or not it shouldn't fail without an error message.

[Adrian Pop]

now the model actually works as expected.