Erroneous equation count with arrays

[massimo ceraolo]

The following model:

model errorSize
Real x[:](start={ 0.2, 0.4, 0.6});
equation
  der(x[1:3])+x[1:3]=fill(1/(time+0.1),3);
end errorSize;

gives rise to the following result when checking:

Check of errorSize completed successfully.
Class errorSize has 3 equation(s) and 1 variable(s).
1 of these are trivial equation(s).

and the model obviously won't run.
AFAIK this is valid modelica

Tested with OM v1.13.0-dev-380-g8b177b9 (WIN 64-bit)