derivative annotation in function casuses the function to not be added to the DAE functiontree

[Per Östlund]

If a function has a derivative annotation, then only it's derivative is added to the function tree of the DAE, and not the function itself. Example:

function g 
  input Real x;
  output Real z;
algorithm
  z := x+1;
end g;

function f 
  input Real x;
  input Real y;
  output Real z;
  annotation(derivative(noDerivative(y=g(x)))=f_der);
algorithm
  z_der := x_der*cos(x);
end f;

function f_der
  input Real x;
  input Real y;
  input Real x_der;
  output Real z_der;
algorithm
  z_der := x+y+x_der;
end f_der;

model Derivative3
  Real x[3];
  Real u[3](each fixed=false);
  type IC=Real(start=0,fixed=true);
  IC ic[2]=x[1:2]-u[1:2];
equation
  x[1]=f(exp(time),g(exp(time)));
  der(x[1:2])=x[2:3];
  x[3]=u[3];
  der(u[1:2])=u[2:3];
end Derivative3;

Output from omc:

function f_der
input Real x;
input Real y;
input Real x_der;
output Real z_der;
algorithm
  z_der := x + y + x_der;
end f_der;

function g
input Real x;
output Real z;
algorithm
  z := 1.0 + x;
end g;

fclass Derivative3
Real x[1];
Real x[2];
Real x[3];
Real u[1](fixed = false);
Real u[2](fixed = false);
Real u[3](fixed = false);
Real ic[1](start = 0.0, fixed = true) = x[1] - u[1];
Real ic[2](start = 0.0, fixed = true) = x[2] - u[2];
equation
  x[1] = f(exp(time),g(exp(time)));
  der(x[1]) = x[2];
  der(x[2]) = x[3];
  x[3] = u[3];
  der(u[1]) = u[2];
  der(u[2]) = u[3];
end Derivative3;

[Per Östlund]

Fixed in revision 5498.