Connectors extending records are not handled

[Per Östlund]

When a connector extends from a record it's not handled correctly, since any cref of the connector type will be considered a connector even though it's also a record. This means that when the cref is an input to a function it will be sent as is, instead of a record being created and sent to the function. Here's an example model that will generate invalid C-code because of this issue:

record R
  Real x;
end R;

connector C
  extends R;
end C;

function f
  input C c;
  output Real x;
algorithm
  x := c.x;
end f;

model test
  C c1(x = 2.0);
  Real x;
equation
  x = f(c1);
end test;

[Per Östlund]

It was decided on the modelica design meeting that only basic types and record, or arrays of them, are allowed in functions. Connectors are thus not allowed in functions. A check for this has been implemented in r9753, so the compiler now gives an error for this model.