Illegal Modelica code is allowed (vectorized expression output from functions) (from MathCore)

[krsta]

The following class is illegal according to Modelica since it contains expressions on left-hand side of the vectorized function output. There is a message that it is not supported when building but building is successfully and a (correct) result is returned.

class EqualityEquations
  Real x,y,z;
function f
 input Real u;
 input Real v;
output Real y[3];
algorithm
 y:={u+v,u-v,u*v};
end f;
equation
  {x+1, y, 1/z} = f(1.0, 2.0); // Illegal!
        // Not a list of variables
        // on the left-hand side
end EqualityEquations;

[Jan Brugård]

​http://intranet/trac/mathmodelica/ticket/1098

[Martin Sjölund]

This is actually supposed to be legal.
The specification says there are two equality equations:
non-tuple Expression = Expression -or- Tuple of cref = FunctionCall

I added a check for tuple of cref in the trunk, so that is now checked. If you have seen somewhere else that it also is illegal for arrays, re-open the bug and post the MSL section.