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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.30  Version 8.33 28-April-2013
5  ------------  --------------------------
7    1.  Added 'U' to some constants that are compared to unsigned integers, to
8        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
9        variables that are added to signed variables, to ensure the result is
10        signed and can be negated.
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
15    3.  Revise the creation of config.h.generic so that all boolean macros are
16        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
17        overriding via -D on the command line possible.
19    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
20        to unsigned int is reported to make a quite noticeable speed difference in
21        a specific Windows environment. Testing on Linux did also appear to show
22        some benefit (and it is clearly not harmful). Also fixed the definition of
23        Xop which should be unsigned.
25    5.  Related to (4), changing the definition of the intermediate variable cc
26        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
27        improvements.
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
37    9.  Optimizing fast_forward_start_bits in JIT.
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
44        (b) Minimum length was not checked before the matching is started.
46    11. The value of capture_last that is passed to callouts was incorrect in some
47        cases when there was a capture on one path that was subsequently abandoned
48        after a backtrack. Also, the capture_last value is now reset after a
49        recursion, since all captures are also reset in this case.
51    12. The interpreter no longer returns the "too many substrings" error in the
52        case when an overflowing capture is in a branch that is subsequently
53        abandoned after a backtrack.
55    13. In the pathological case when an offset vector of size 2 is used, pcretest
56        now prints out the matched string after a yield of 0 or 1.
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
63    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
64        offset of the starting point of the matching process, provided the offsets
65        vector is large enough.
67    17. The \A escape now records a lookbehind value of 1, though its execution
68        does not actually inspect the previous character. This is to ensure that,
69        in partial multi-segment matching, at least one character from the old
70        segment is retained when a new segment is processed. Otherwise, if there
71        are no lookbehinds in the pattern, \A might match incorrectly at the start
72        of a new segment.
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
76    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
77        gives some modest performance improvement in 8-bit mode.
79    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
80        be expressed in certain programming languages using Universal Character
81        Names.
83    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
84        which points out that "non characters" are not "characters that may not
85        appear in Unicode strings" but rather "characters that are reserved for
86        internal use and have only local meaning".
88    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
89        there was a conditional group that depended on an assertion, if the
90        assertion was false, the callout that immediately followed the alternation
91        in the condition was skipped when pcre_exec() was used for matching.
93    23. Allow an explicit callout to be inserted before an assertion that is the
94        condition for a conditional group, for compatibility with automatic
95        callouts, which always insert a callout at this point.
97    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
98        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
100    25. (*PRUNE) is now supported by the JIT compiler.
102    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
104    27. Fix the case where there are two or more SKIPs with arguments that may be
105        ignored.
107    28. (*SKIP) is now supported by the JIT compiler.
109    29. (*THEN) is now supported by the JIT compiler.
111    30. Update RunTest with additional test selector options.
113    31. The way PCRE handles backtracking verbs has been changed in two ways.
115        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
116        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
117        backtracking. In some cases this makes it more Perl-compatible, but Perl's
118        rather obscure rules do not always do the same thing.
120        (2) Previously, backtracking verbs were confined within assertions. This is
121        no longer the case for positive assertions, except for (*ACCEPT). Again,
122        this sometimes improves Perl compatibility, and sometimes does not.
124    32. A number of tests that were in test 2 because Perl did things differently
125        have been moved to test 1, because either Perl or PCRE has changed, and
126        these tests are now compatible.
128    32. Control verbs are handled in the same way in JIT and interpreter.
130    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
131        contained a forward subroutine reference caused a compile error.
133    34. Auto-detect and optimize limited repetitions in JIT.
135    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
136        blocking (*UTF) etc.
138    36. In the interpreter, maximizing pattern repetitions for characters and
139        character types now use tail recursion, which reduces stack usage.
141    37. The value of the max lookbehind was not correctly preserved if a compiled
142        and saved regex was reloaded on a host of different endianness.
144    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
145        of the compiled pattern block, expand the flags field from 16 to 32 bits
146        because it was almost full.
148    39. Try madvise first before posix_madvise.
150    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
151        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
152        original change locked out all matches of empty strings. This has been
153        changed so that one match of an empty string per line is recognized.
154        Subsequent searches on the same line (for colouring or for --only-matching,
155        for example) do not recognize empty strings.
157    41. Applied a user patch to fix a number of spelling mistakes in comments.
159    42. Data lines longer than 65536 caused pcretest to crash.
161    44. Clarified the data type for length and startoffset arguments for pcre_exec
162        and pcre_dfa_exec in the function-specific man pages, where they were
163        explicitly stated to be in bytes, never having been updated. I also added
164        some clarification to the pcreapi man page.
167    Version 8.32 30-November-2012
168    -----------------------------
170    1.  Improved JIT compiler optimizations for first character search and single
171        character iterators.
173    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
174        Patch by Daniel Richard G.
176    3.  Single character iterator optimizations in the JIT compiler.
178    4.  Improved JIT compiler optimizations for character ranges.
180    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
181        Reported by Giuseppe D'Angelo.
183    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
184        of a line, was being set incorrectly in cases where .* appeared inside
185        atomic brackets at the start of a pattern, or where there was a subsequent
186        *PRUNE or *SKIP.
188    7.  Improved instruction cache flush for POWER/PowerPC.
189        Patch by Daniel Richard G.
191    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
192        grep:
194        (a) There is now no limit to the number of patterns to be matched.
196        (b) An error is given if a pattern is too long.
198        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
199            are now supported.
201        (d) --exclude-from and --include-from (multiple use) have been added.
203        (e) Exclusions and inclusions now apply to all files and directories, not
204            just to those obtained from scanning a directory recursively.
206        (f) Multiple uses of -f and --file-list are now supported.
208        (g) In a Windows environment, the default for -d has been changed from
209            "read" (the GNU grep default) to "skip", because otherwise the presence
210            of a directory in the file list provokes an error.
212        (h) The documentation has been revised and clarified in places.
214    9.  Improve the matching speed of capturing brackets.
216    10. Changed the meaning of \X so that it now matches a Unicode extended
217        grapheme cluster.
219    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
220        out POSIX threads when JIT support is configured.
222    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
224    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
225        structure could go wrong in environments where size_t is not the same size
226        as int.
228    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
229        set.
231    15. The EBCDIC support had decayed; later updates to the code had included
232        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
233        general tidy up of EBCDIC-related issues, and the documentation was also
234        not quite right. There is now a test that can be run on ASCII systems to
235        check some of the EBCDIC-related things (but is it not a full test).
237    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
238        in a small tidy to the code.
240    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
242    18. If the --only-matching (-o) option in pcregrep is specified multiple
243        times, each one causes appropriate output. For example, -o1 -o2 outputs the
244        substrings matched by the 1st and 2nd capturing parentheses. A separating
245        string can be specified by --om-separator (default empty).
247    19. Improving the first n character searches.
249    20. Turn case lists for horizontal and vertical white space into macros so that
250        they are defined only once.
252    21. This set of changes together give more compatible Unicode case-folding
253        behaviour for characters that have more than one other case when UCP
254        support is available.
256        (a) The Unicode property table now has offsets into a new table of sets of
257            three or more characters that are case-equivalent. The MultiStage2.py
258            script that generates these tables (the pcre_ucd.c file) now scans
259            CaseFolding.txt instead of UnicodeData.txt for character case
260            information.
262        (b) The code for adding characters or ranges of characters to a character
263            class has been abstracted into a generalized function that also handles
264            case-independence. In UTF-mode with UCP support, this uses the new data
265            to handle characters with more than one other case.
267        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
268            whose other case is greater than 256 are now correctly matched
269            caselessly. Previously, the high codepoint matched the low one, but not
270            vice versa.
272        (d) The processing of \h, \H, \v, and \ in character classes now makes use
273            of the new class addition function, using character lists defined as
274            macros alongside the case definitions of 20 above.
276        (e) Caseless back references now work with characters that have more than
277            one other case.
279        (f) General caseless matching of characters with more than one other case
280            is supported.
282    22. Unicode character properties were updated from Unicode 6.2.0
284    23. Improved CMake support under Windows. Patch by Daniel Richard G.
286    24. Add support for 32-bit character strings, and UTF-32
288    25. Major JIT compiler update (code refactoring and bugfixing).
289        Experimental Sparc 32 support is added.
291    26. Applied a modified version of Daniel Richard G's patch to create
292        pcre.h.generic and config.h.generic by "make" instead of in the
293        PrepareRelease script.
295    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
296        pcre_compile.c when checking for a zero character.
298    28. Introducing a native interface for JIT. Through this interface, the compiled
299        machine code can be directly executed. The purpose of this interface is to
300        provide fast pattern matching, so several sanity checks are not performed.
301        However, feature tests are still performed. The new interface provides
302        1.4x speedup compared to the old one.
304    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
305        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
306        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
308    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
309        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
310        the "old" RFC 2279). Instead, it ended up passing a negative length to
311        pcre_exec().
313    31. Add support for GCC's visibility feature to hide internal functions.
315    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
316        "unknown -C option" after outputting 0 or 1.
318    33. There is now support for generating a code coverage report for the test
319        suite in environments where gcc is the compiler and lcov is installed. This
320        is mainly for the benefit of the developers.
322    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
323        unaddressable using valgrind annotations, allowing valgrind to detect
324        invalid memory accesses. This is mainly for the benefit of the developers.
326    25. (*UTF) can now be used to start a pattern in any of the three libraries.
328    26. Give configure error if --enable-cpp but no C++ compiler found.
331    Version 8.31 06-July-2012
332    -------------------------
334    1.  Fixing a wrong JIT test case and some compiler warnings.
336    2.  Removed a bashism from the RunTest script.
338    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
339        to unsigned type, result still unsigned" that was given by an MS compiler
340        on encountering the code "-sizeof(xxx)".
342    4.  Partial matching support is added to the JIT compiler.
344    5.  Fixed several bugs concerned with partial matching of items that consist
345        of more than one character:
347        (a) /^(..)\1/ did not partially match "aba" because checking references was
348            done on an "all or nothing" basis. This also applied to repeated
349            references.
351        (b) \R did not give a hard partial match if \r was found at the end of the
352            subject.
354        (c) \X did not give a hard partial match after matching one or more
355            characters at the end of the subject.
357        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
358            a partial match for the string "\r".
360        (e) When newline was set to CRLF, the metacharacter "." did not recognize
361            a partial match for a CR character at the end of the subject string.
363    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
364        running pcretest, the text "(JIT)" added to the output whenever JIT is
365        actually used to run the match.
367    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
368        or /S+[+] with a digit between 1 and 7.
370    8.  OP_NOT now supports any UTF character not just single-byte ones.
372    9.  (*MARK) control verb is now supported by the JIT compiler.
374    10. The command "./RunTest list" lists the available tests without actually
375        running any of them. (Because I keep forgetting what they all are.)
379    12. Applied a (slightly modified) user-supplied patch that improves performance
380        when the heap is used for recursion (compiled with --disable-stack-for-
381        recursion). Instead of malloc and free for each heap frame each time a
382        logical recursion happens, frames are retained on a chain and re-used where
383        possible. This sometimes gives as much as 30% improvement.
385    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
386        call.
388    14. As documented, (*COMMIT) is now confined to within a positive assertion.
390    15. It is now possible to link pcretest with libedit as an alternative to
391        libreadline.
393    16. (*COMMIT) control verb is now supported by the JIT compiler.
395    17. The Unicode data tables have been updated to Unicode 6.1.0.
397    18. Added --file-list option to pcregrep.
399    19. Added binary file support to pcregrep, including the -a, --binary-files,
400        -I, and --text options.
402    20. The madvise function is renamed for posix_madvise for QNX compatibility
403        reasons. Fixed by Giuseppe D'Angelo.
405    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
407    22. Changed the option for creating symbolic links for 16-bit man pages from
408        -s to -sf so that re-installing does not cause issues.
410    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
412    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
413        matches in certain environments (the workspace was not being correctly
414        retained). Also added to pcre_dfa_exec() a simple plausibility check on
415        some of the workspace data at the beginning of a restart.
417    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
418        was not doing so when it should - probably a typo introduced by SVN 528
419        (change 8.10/14).
421    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
422        \w+ when the character tables indicated that \x{c4} was a word character.
423        There were several related cases, all because the tests for doing a table
424        lookup were testing for characters less than 127 instead of 255.
426    27. If a pattern contains capturing parentheses that are not used in a match,
427        their slots in the ovector are set to -1. For those that are higher than
428        any matched groups, this happens at the end of processing. In the case when
429        there were back references that the ovector was too small to contain
430        (causing temporary malloc'd memory to be used during matching), and the
431        highest capturing number was not used, memory off the end of the ovector
432        was incorrectly being set to -1. (It was using the size of the temporary
433        memory instead of the true size.)
435    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
436        ovector size, it uses memory at the end of the block that it has got.
438    29. Check for an overlong MARK name and give an error at compile time. The
439        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
441    30. JIT compiler update.
443    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
444        Rill for the patch.
446    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
448    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
450    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
451        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
452        was enabled.
454    35. Improve JIT code generation for greedy plus quantifier.
456    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
457        1 to "aa" instead of to an empty string. The bug affected repeated groups
458        that could potentially match an empty string.
460    37. Optimizing single character iterators in JIT.
462    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
463        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
464        codepoints that are too big for the mode are faulted, and in a UTF mode,
465        disallowed codepoints are also faulted.
467    39. If PCRE was compiled with UTF support, in three places in the DFA
468        matcher there was code that should only have been obeyed in UTF mode, but
469        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
470        processing when bytes with values greater than 127 were present. In 16-bit
471        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
472        both cases the values are those that cannot be the first data item in a UTF
473        character. The three items that might have provoked this were recursions,
474        possessively repeated groups, and atomic groups.
476    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
477        and pcregrep, because some OS require shared objects to be explicitly
478        passed to ld, causing the link step to fail if they are not.
480    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
481        mode, patterns that started with \h* or \R* might be incorrectly matched.
484    Version 8.30 04-February-2012
485    -----------------------------
487  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
488      name is defined in ctype.h.      name is defined in ctype.h.
490  2.  Fixed a bug in the code for calculating the fixed length of lookbehind  2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
491      assertions.      only in quite long subpatterns.
493  3.  Removed the function pcre_info(), which has been obsolete and deprecated  3.  Removed the function pcre_info(), which has been obsolete and deprecated
494      since it was replaced by pcre_fullinfo() in February 2000.      since it was replaced by pcre_fullinfo() in February 2000.
496  4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not  4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
497      match a (*MARK), and the match failed at the start of the subject, a      match a (*MARK), and the match failed at the start of the subject, a
498      reference to memory before the start of the subject could occur. This bug      reference to memory before the start of the subject could occur. This bug
499      was introduced by fix 17 of release 8.21.      was introduced by fix 17 of release 8.21.
501  5.  A reference to an unset group with zero minimum repetition was giving  5.  A reference to an unset group with zero minimum repetition was giving
502      totally wrong answers (in non-JavaScript-compatibility mode). For example,      totally wrong answers (in non-JavaScript-compatibility mode). For example,
503      /(another)?(\1?)test/ matched against "hello world test". This bug was      /(another)?(\1?)test/ matched against "hello world test". This bug was
504      introduced in release 8.13.      introduced in release 8.13.
506  6.  Add support for 16-bit character strings (a large amount of work involving  6.  Add support for 16-bit character strings (a large amount of work involving
507      many changes and refactorings).      many changes and refactorings).
509    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
510        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
511        from a file.
513    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
514        rounding is not applied in this particular case).
516    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
517        if they appear, or are escaped, in patterns.
519    10. Get rid of a number of -Wunused-but-set-variable warnings.
521    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
522        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
523        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
524        also returns the mark "x". This bug applied to capturing parentheses,
525        non-capturing parentheses, and atomic parentheses. It also applied to some
526        assertions.
528    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
529        information out of configure.ac instead of relying on pcre.h.generic, which
530        is not stored in the repository.
532    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
533        -lreadline.
535    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
537    15. Applied Graycode's patch to put the top-level frame on the stack rather
538        than the heap when not using the stack for recursion. This gives a
539        performance improvement in many cases when recursion is not deep.
541    16. Experimental code added to "pcretest -C" to output the stack frame size.
544  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011
545  ------------------------  ------------------------
# Line 1157  Version 7.9 11-Apr-09 Line 1671  Version 7.9 11-Apr-09
1671  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1672      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1673      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1674      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1675        8.33.]
1677  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1678      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1400  Version 7.7 07-May-08 Line 1915  Version 7.7 07-May-08
1915      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
1916      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
1917      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
1918      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
1919      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
1920      was subsequently set up correctly.)      was subsequently set up correctly.)

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