review comment

Author: eendebakpt

Lib/re/_compiler.py

@@ -266,7 +266,9 @@ def _optimize_charset(charset, iscased=None, fixup=None, fixes=None):
                     else:
                         charmap[av] = 1
                 elif op is RANGE:
-                    r = range(av[0], av[1]+1)
+                    start, end = av
+                    end += 1
+                    r = range(start, end)
                     if fixup: # IGNORECASE and not LOCALE
                         if fixes:
                             for i in map(fixup, r):
@@ -280,11 +282,10 @@ def _optimize_charset(charset, iscased=None, fixup=None, fixes=None):
                         if not hascased:
                             hascased = any(map(iscased, r))
                     else:
-                        end = av[1] + 1
                         if end > len(charmap):
                             # Trigger the IndexError growth path below.
                             raise IndexError
-                        charmap[av[0]:end] = b'\x01' * (end - av[0])
+                        charmap[start:end] = b'\x01' * (end - start)
                 elif op is NEGATE:
                     out.append((op, av))
                 elif op is CATEGORY and tail and (CATEGORY, CH_NEGATE[av]) in tail: