Merge branch 'fix_minusminus' into 'master'

split -- operator in two operators

See merge request IPDSnelting/mjtest-tests!27

syntax/operators.mj

 class name {
     public void method() {
-        (!---!-!!!!!-42 && x + 5 != y || 42 == 13 * 4 = x / 42 % z - 576 <= 18 > 11 + 3--4).method2(3+4, false, null);
+        (!- - -!-!!!!!-42 && x + 5 != y || 42 == 13 * 4 = x / 42 % z - 576 <= 18 > 11 + 3 - - 4).method2(3+4, false, null);
     }
 }
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