51     const char* np = nullptr;  in test()  local
52     std::codecvt_base::result r = c.in(m, n, n + 4, np, w, w + 2, wp);  in test()
55     assert(np == n);  in test()
60     r = c.in(m, n, n + 3, np, w, w + 2, wp);  in test()
63     assert(np == n);  in test()
67     r = c.in(m, n, n + 2, np, w, w + 2, wp);  in test()
70     assert(np == n + 2);  in test()
74     r = c.in(m, n, n + 1, np, w, w + 2, wp);  in test()
77     assert(np == n + 1);  in test()
88     const char* np = nullptr;  in test()  local
89     std::codecvt_base::result r = c.in(m, n, n + 7, np, w, w + 2, wp);  in test()
92     assert(np == n + 7);  in test()
99     r = c.in(m, n, n + 3, np, w, w + 2, wp);  in test()
102     assert(np == n + 3);  in test()
107     r = c.in(m, n, n + 2, np, w, w + 2, wp);  in test()
110     assert(np == n + 2);  in test()
114     r = c.in(m, n, n + 1, np, w, w + 2, wp);  in test()
117     assert(np == n + 1);  in test()
131     const char* np = nullptr;  in test()  local
132     std::codecvt_base::result r = c.in(m, n, n + 4, np, w, w + 2, wp);  in test()
135     assert(np == n + 4);  in test()
142     r = c.in(m, n, n + 3, np, w, w + 2, wp);  in test()
145     assert(np == n + 3);  in test()
150     r = c.in(m, n, n + 2, np, w, w + 2, wp);  in test()
153     assert(np == n + 2);  in test()
157     r = c.in(m, n, n + 1, np, w, w + 2, wp);  in test()
160     assert(np == n + 1);  in test()
170     const char* np = nullptr;  in test()  local
171     std::codecvt_base::result r = c.in(m, n, n + 4, np, w, w + 2, wp);  in test()
174     assert(np == n);  in test()
179     r = c.in(m, n, n + 3, np, w, w + 2, wp);  in test()
182     assert(np == n);  in test()
186     r = c.in(m, n, n + 2, np, w, w + 2, wp);  in test()
189     assert(np == n + 2);  in test()
193     r = c.in(m, n, n + 1, np, w, w + 2, wp);  in test()
196     assert(np == n + 1);  in test()
207     const char* np = nullptr;  in test()  local
208     std::codecvt_base::result r = c.in(m, n, n + 7, np, w, w + 2, wp);  in test()
211     assert(np == n + 7);  in test()
218     r = c.in(m, n, n + 3, np, w, w + 2, wp);  in test()
221     assert(np == n + 3);  in test()
226     r = c.in(m, n, n + 2, np, w, w + 2, wp);  in test()
229     assert(np == n + 2);  in test()
233     r = c.in(m, n, n + 1, np, w, w + 2, wp);  in test()
236     assert(np == n + 1);  in test()