126     int[int] aax;  in test3825()
129     aax = null, aay = null;  in test3825()
130     assert(thrown(aax[0]));  in test3825()
131     assert(thrown(aax[0]   = aax[0]));  // rhs throws  in test3825()
132     assert(thrown(aax[0]  += aax[0]));  // rhs throws  in test3825()
133     assert(thrown(aax[0] ^^= aax[0]));  // rhs throws  in test3825()
135     aax = null;   aax[0]   = 1;  assert(aax[0] ==  1);  // setting aax[0] is OK  in test3825()
136     aax = null;   aax[0]  += 1;  assert(aax[0] == +1);  // setting aax[0] to 0 and modify it is OK  in test3825()
137     aax = null;   aax[0] ^^= 1;  assert(aax[0] ==  0);  // setting aax[0] to 0 and modify it is OK  in test3825()
139     aax = null; ++aax[0];        assert(aax[0] == +1);  // setting aax[0] to 0 and modify it is OK  in test3825()
140     aax = null; --aax[0];        assert(aax[0] == -1);  // setting aax[0] to 0 and modify it is OK  in test3825()
142     aax = [0:0], aay = [0:null];  in test3825()
143     assert(thrown(aax[aax[1]]   = 1));  // accessing aax[1] in key part throws  in test3825()
144     assert(thrown(aax[aax[1]]  += 1));  // accessing aax[1] in key part throws  in test3825()
145     assert(thrown(aax[aax[1]] ^^= 1));  // accessing aax[1] in key part throws  in test3825()
146     assert(thrown(aay[aax[1]]  ~= [])); // accessing aax[1] in key part throws  in test3825()
154 …  assert(thrown(aax[((){ n=aax[1]; return 0;}())] = 0)); // accessing aax[1] in key part, throws OK  in test3825()