impure functions are not constant

[Lennart Ochel]

Remove simple equations does not handle impure functions correctly:

Example 1:

model test
  Boolean a = initial();
end test;

Example 2:

model test2
  impure function impureTest
    output Integer x;

    external "C" x = _impureTest() annotation(Include = "#include <stdlib.h>
                                                         int _impureTest()
                                                         {
                                                           static int d=0;
                                                           return (double)++d;
                                                         }");
  end impureTest;

  Real r = impureTest();
end test2;

[Lennart Ochel]

This is fixed in r20907.

[Lennart Ochel]

See also r20789 and r20848.