Problem:    New regexp performance: Copying a lot of position state.
Solution:   Only copy the sub-expressions that are being used.

Problem:    New regexp performance: Calling no_Magic() very often.
Solution:   Remove magicness inline.

Problem:    New regexp: pattern that includs a new-line matches too early.
            (john McGowan)
Solution:   Do not start searching in the second line.

Problem:    New regexp: not matching newline in string. (Marc Weber)
Solution:   Check for "\n" character.

Problem:    New regexp: End of matching pattern not set correctly. (Cesar
            Romani)
Solution:   Quit the loop after finding the match.  Store nfa_has_zend in the
            program.

Problem:    Searching for composing char only and using \Z has different
            results.
Solution:   Make it match the composing char, matching everything is not
            useful.

Problem:    Compiler warning for shadowed variable. (John Little)
Solution:   Move declaration, rename variables.

Problem:    New regexp engine does not ignore order of composing chars.
Solution:   Ignore composing chars order.

Problem:    Not all patterns are tested with auto / old / new engine.
Solution:   Test patterns with three values of 'regexpengine'.

Problem:    These do not work with the new regexp engine: \%o123, \%x123,
            \%d123, \%u123 and \%U123.
Solution:   Implement these items.

Problem:    New regexp engine wastes memory.
Solution:   Allocate prog with actual number of states, not estimated maximum
            number of sates.

Problem:    Zero width match changes length of match.
Solution:   For a zero width match put new states in the current position in
            the state list.

Problem:    Unused field in nfa_state.
Solution:   Remove lastthread.

Problem:    New regexp engine: Matching composing characters is wrong.
Solution:   Fix matching composing characters.

Problem:    New regexp state dump is hard to read.
Solution:   Make the state dump more pretty. (Taro Muraoka)

Problem:    New regexp logging is a bit messy.
Solution:   Consistently use #defines, add explanatory comment. (Taro Muraoka)

Problem:    \Z does not work properly with the new regexp engine.
Solution:   Make \Z work.  Add tests.

Problem:    New regexp engine is inefficient with multi-byte characters.
Solution:   Handle a character at a time instead of a byte at a time.  Also
            make \Z partly work.

Problem:    New regexp: adding \Z makes every character match.
Solution:   Only apply ireg_icombine for composing characters.
            Alsl add missing change from patch 1008. (Ken Takata)

Problem:    Compiler warning for ambiguous else.
Solution:   Add curly braces.

Problem:    Test 95 fails on MS-Windows.
Solution:   Set 'nomore'. Change \i to \f.  Change multi-byte character to
            something that is not matching \i. (Ken Takata)

Problem:    Can't build on Minix 3.2.1.
Solution:   Add a condition to an #ifdef. (Gautam Tirumala)

Problem:    NFA engine not used for "\_[0-9]".
Solution:   Enable this, fixed in patch 1005.

Problem:    Get stuck on regexp "\n*" and on "%s/^\n\+/\r".
Solution:   Fix handling of matching a line break. (idea by Hirohito Higashi)

Problem:    No error when option could not be set.
Solution:   Report an error. (ZyX)

Problem:    Python interface does not compile with Python 2.2
Solution:   Fix thread issues and True/False. (ZyX)

Problem:    Valgrind errors for Python interface.
Solution:   Fix memory leaks when running tests. (ZyX)

Problem:    Duplicate condition in if.
Solution:   Remove one condition.

Problem:    Typo in char value causes out of bounds access.
Solution:   Fix character value.  (Klemens Baum)

Problem:    New regexp engine sets curbuf temporarily.
Solution:   Use reg_buf instead, like the old engine.

Problem:    Python: garbage collection issues.
Solution:   Fix the GC issues: Use proper DESTRUCTOR_FINISH: avoids negative
            refcounts, use PyObject_GC_* for objects with tp_traverse and
            tp_clear, add RangeTraverse and RangeClear, use Py_XDECREF in some
            places. (ZyX)

Problem:    Vim and Python exceptions are different.
Solution:   Make Vim exceptions be Python exceptions. (ZyX)

Problem:    Python: Can't check types of what is returned by bindeval().
Solution:   Add vim.List, vim.Dictionary and vim.Function types. (ZyX)

Problem:    Python: Module initialization is duplicated.
Solution:   Move to shared file. (ZyX)

Problem:    Python: using magic constants.
Solution:   Use descriptive values for ml_flags. (ZyX)

Problem:    Python: Later patch does things slightly differently.
Solution:   Adjusted argument type changes. (ZyX)

Problem:    Python: Too many type casts.
Solution:   Change argument types. (ZyX)

Problem:    More can be shared by Python 2 and 3.
Solution:   Move more stuff to if_py_both. (ZyX)

Problem:    Memory leak in new regexp engine.
Solution:   Jump to end of function to free memory. (Dominique Pelle)