Constants not evaluated in match patterns

[Per Östlund]

Calling the following function from a script result in a compiler error "use of undeclared identifier '_n'. It seems we don't constant evaluate constants that are used in patterns, which we probably should.

package P
  constant Integer n = 2;

  function f
    input Integer x;
  algorithm
    _ := match x
      case n then ();
      else ();
    end match;
  end f;
end P;

function test
  input Integer x;
algorithm
  P.f(x);
end test;