Problem:    Yaml highlighting is slow.
Solution:   Tune the estimation of pattern failure chance.

Problem:    fail_if_missing not used for Python 3.
Solution:   Give an error when Python 3 can't be configured. (Andrei Olsen)

Problem:    Valgrind reports errors when using backreferences. (Dominique
            Pelle)
Solution:   Do not check the end of submatches.

Problem:    Backreference to previous line doesn't work. (Lech Lorens)
Solution:   Implement looking in another line.

Problem:    Compiler warning for parentheses. (Christian Wellenbrock)
Solution:   Change #ifdef.

Problem:    Highlighting is still wrong sometimes. (Dominique Pelle)
Solution:   Also restore reginput properly.

Problem:    Newline characters messing up error message.
Solution:   Remove the newlines. (Kazunobu Kuriyama)

Problem:    "s:" is recognized but "<SID>" is not. (ZyX)
Solution:   Translate "<SID>" like "s:".

Problem:    Python 3: test 87 may crash.
Solution:   Use _PyArg_Parse_SizeT instead of PyArg_Parse. (Jun Takimoto)

Problem:    New regexp engine: no match with ^ after \n. (SungHyun Nam)
Solution:   Fix it, add a test.

Problem:    Highlighting is sometimes wrong. (Axel Bender)
Solution:   Fetch regline again when returning from recursive regmatch.

Problem:    Python tests 86 and 87 fail.
Solution:   Add "empty" files. (ZyX)

Problem:    'backupcopy' default on MS-Windows does not work for hard and soft
            links.
Solution:   Check for links. (David Pope, Ken Takata)

Problem:    Wrong error message for 1.0[0].
Solution:   Check for funcref and float separately. (Yasuhiro Matsumoto)

Problem:    When current directory changes, path from cscope may no longer be
            valid. (AS Budden)
Solution:   Always store the absolute path. (Christian Brabandt)

Problem:    When a global mapping starts with the same characters as a
            buffer-local mapping Vim waits for a character to be typed to find
            out whether the global mapping is to be used. (Andy Wokula)
Solution:   Use the local mapping without waiting. (Michael Henry)

Problem:    Can't put all Vim config files together in one directory.
Solution:   Load ~/.vim/vimrc if ~/.vimrc does not exist. (Lech Lorens)

Problem:    Wasting memory on padding.
Solution:   Reorder struct fields. (Dominique Pelle)

Problem:    Compiler warnings on 64 bit system.
Solution:   Add type casts. (Mike Williams)

Problem:    Using isalpha() and isalnum() can be slow.
Solution:   Use range checks. (Mike Williams)

Problem:    Python 2 and 3 use different ways to load modules.
Solution:   Use the same method. (ZyX)

Problem:    Python 2 tests don't have the same output everywhere.
Solution:   Make the Python 2 tests more portable. (ZyX)

Problem:    Python 2: loading modules doesn't work well.
Solution:   Fix the code. Add more tests. (ZyX)

Problem:    Check for digits and ascii letters can be faster.
Solution:   Use a trick with one comparison. (Dominique Pelle)

Problem:    Patch 7.3.1058 breaks backwards compatibility, not possible to use
            a function reference as a string. (lilydjwg)
Solution:   Instead of translating the function name only translate "s:".

Problem:    New regexp engine: some work is done while executing a pattern,
            even though the result is predictable.
Solution:   Do the work while compiling the pattern.

Problem:    Python "sane" configure checks give a warning message.
Solution:   Use single quotes intead of escaped double quotes. (Ben Fritz)

Problem:    Python configure check doesn't reject Python 2 when requesting
            Python 3.  Some systems need -pthreads instead of -pthread.
Solution:   Adjust configure accordingly. (Andrei Olsen)

Problem:    Loading Python modules is not tested.
Solution:   Enable commented-out tests, add missing files. (ZyX)

Problem:    HP-UX compiler can't handle zero size array. (Charles Cooper)
Solution:   Make the array one item big.

Problem:    Can't test what is actually displayed on screen.
Solution:   Add the screenchar() and screenattr() functions.

Problem:    Not easy to load Python modules.
Solution:   Search "python2", "python3" and "pythonx" directories in
            'runtimepath' for Python modules. (ZyX)

Problem:    Python: Memory leaks
Solution:   Add more Py_DECREF(). (ZyX)

Problem:    Python: PyList_SetItem() is inefficient.
Solution:   Use PyList_SET_ITEM() (ZyX)

Problem:    Mixing long and pointer doesn't always work.
Solution:   Avoid cast to pointer.

Problem:    The round() function is not always available. (Christ van
            Willegen)
Solution:   Use the solution from f_round().

Problem:    Crash when running test 86. (Jun Takimoto)
Solution:   Define PY_SSIZE_T_CLEAN early. (Elimar Riesebieter)

Problem:    New regexp engine fails on "\(\<command\)\@<=.*"
Solution:   Fix rule for postponing match.  Further tune estimating whether
            postponing works better.  Add test.