Overriding a parameter that sets a parameter in a record has no effect

[jwharington@…]

Consider the following:

record MyRecord
  Real y;
end MyRecord;

function InitRecord
  input Real  x;
  output MyRecord s(y = x);
end InitRecord;

model test
  parameter Real t = 1;
  parameter MyRecord r = InitRecord (t);

algorithm
  print("t="+String(t)+" ");
  print("r.y="+String(r.y)+"\n");
  assert(t== r.y, "Correct assignment from structure");
end test;

When running this with default values of 't', this works as expected.

However, when overriding 't' on the command line or via _init.xml, the record's parameter is not updated. In this example program, running the program has an assertion failure:

./test -override t=2 

t=2 r.y=1
assert            | warning | The following assertion has been violated during initialization at time 0.000000
|                 | |       | t == r.y
assert            | error   | Correct assignment from structure
assert            | info    | simulation terminated by an assertion at initialization

More information: similar test program which assigns an element of an array works correctly, as does assigning a simple scalar parameter.

[Martin Sjölund]

This seems to come from record equations being evaluated in the frontend, but it doesn't register that t was evaluated and thus should be marked not changeable.