Merge branch 'group4' into 'master'

Exec test cases of Rust Team

See merge request IPDSnelting/mjtest-tests!50

exec/while.mj

+class A {
+
+    public static void main(String[] args) {
+        int x = 0;
+        boolean a = false;
+        while(a) { x = 1; }
+        System.out.println(x);
+
+        while(x < 5) { x = x + 1; }
+        System.out.println(x);
+    }
+}
+

exec/while.mj.out

+0
+5