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The last fall-through warning is in _codecs_iso2022.c. IMO the
current code is equivalent to this, but I'm no codecs expert at
all:
diff --git a/Modules/cjkcodecs/_codecs_iso2022.c b/Modules/cjkcodecs/_codecs_iso2022.c
index 1ce4218f30..abf214880f 100644
--- a/Modules/cjkcodecs/_codecs_iso2022.c
+++ b/Modules/cjkcodecs/_codecs_iso2022.c
@@ -807,15 +807,9 @@ jisx0213_encoder(const Py_UCS4 *data, Py_ssize_t *length, void *config)
 case 2: /* second character of unicode pair */
 coded = find_pairencmap((ucs2_t)data[0], (ucs2_t)data[1],
 jisx0213_pair_encmap, JISX0213_ENCPAIRS);
- if (coded == DBCINV) {
- *length = 1;
- coded = find_pairencmap((ucs2_t)data[0], 0,
- jisx0213_pair_encmap, JISX0213_ENCPAIRS);
- if (coded == DBCINV)
- return MAP_UNMAPPABLE;
- }
- else
+ if (coded != DBCINV) {
 return coded;
+ /* fall through */
 
 case -1: /* flush unterminated */
 *length = 1;