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1 | =head1 NAME |
2 | |
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3 | perldelta - what is new for perl v5.11.3 |
4 | |
5 | =head1 DESCRIPTION |
6 | |
166777da |
7 | This document describes differences between the 5.11.2 release and |
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8 | the 5.11.3 release. |
9 | |
c308b6b9 |
10 | If you are upgrading from an earlier release such as 5.11.1, first read |
11 | the L<perl5112delta>, which describes differences between 5.11.1 and |
12 | 5.11.2 |
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13 | |
14 | =head1 Incompatible Changes |
15 | |
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16 | =over |
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17 | |
1f5724d9 |
18 | =item Filehandles are blessed directly into C<IO::Handle::>, as C<FileHandle> is merely a wrapper around C<IO::Handle>. |
19 | |
d350938a |
20 | The previous behaviour was to bless Filehandles into L<FileHandle> |
c308b6b9 |
21 | (an empty proxy class) if it was loaded into memory and otherwise |
22 | to bless them into C<IO::Handle::>. |
23 | |
db2ed548 |
24 | |
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25 | =back |
2e8102e6 |
26 | |
27 | =head1 Core Enhancements |
28 | |
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29 | =head2 Unicode version |
30 | |
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31 | Perl is shipped with the latest Unicode version, 5.2, dated October 2009. See |
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32 | L<http://www.unicode.org/versions/Unicode5.2.0> for details about this release |
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33 | of Unicode. See L<perlunicode> for instructions on installing and using |
34 | older versions of Unicode. |
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35 | |
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36 | =head2 Unicode properties |
37 | |
38 | Perl can now handle every Unicode character property. A new pod, |
39 | L<perluniprops>, lists all available non-Unihan character properties. By |
40 | default the Unihan properties and certain others (deprecated and Unicode |
41 | internal-only ones) are not exposed. See below for more details on |
42 | these; there is also a section in the pod listing them, and why they are |
43 | not exposed. |
44 | |
45 | Perl now fully supports the Unicode compound-style of using C<=> and C<:> |
46 | in writing regular expressions: C<\p{property=value}> and |
47 | C<\p{property:value}> (both of which mean the same thing). |
48 | |
db2ed548 |
49 | Perl now fully supports the Unicode loose matching rules for text |
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50 | between the braces in C<\p{...}> constructs. In addition, Perl also allows |
51 | underscores between digits of numbers. |
52 | |
53 | All the Unicode-defined synonyms for properties and property values are |
54 | now accepted. |
55 | |
37e2e78e |
56 | C<qr/\X/>, which matches a Unicode logical character, has been expanded to work |
57 | better with various Asian languages. It now is defined as an C<extended |
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58 | grapheme cluster>. (See L<http://www.unicode.org/reports/tr29/>). |
c670e63a |
59 | Anything matched previously that made sense will continue to be matched. But |
60 | in addition: |
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61 | |
62 | =over |
63 | |
64 | =item * |
65 | |
66 | C<\X> will now not break apart a C<S<CR LF>> sequence. |
67 | |
68 | =item * |
69 | |
70 | C<\X> will now match a sequence including the C<ZWJ> and C<ZWNJ> characters. |
71 | |
72 | =item * |
73 | |
74 | C<\X> will now always match at least one character, including an initial mark. |
75 | Marks generally come after a base character, but it is possible in Unicode to |
76 | have them in isolation, and C<\X> will now handle that case, for example at the |
c670e63a |
77 | beginning of a line or after a C<ZWSP>. And this is the part where C<\X> |
78 | doesn't match the things that it used to that don't make sense. Formerly, for |
79 | example, you could have the nonsensical case of an accented LF. |
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80 | |
81 | =item * |
82 | |
83 | C<\X> will now match a (Korean) Hangul syllable sequence, and the Thai and Lao |
84 | exception cases. |
85 | |
86 | =back |
87 | |
88 | Otherwise, this change should be transparent for the non-affected languages. |
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89 | |
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90 | C<\p{...}> matches using the Canonical_Combining_Class property were |
91 | completely broken in previous Perls. This is now fixed. |
92 | |
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93 | In previous Perls, the Unicode C<Decomposition_Type=Compat> property and a |
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94 | Perl extension had the same name, which led to neither matching all the |
95 | correct values (with more than 100 mistakes in one, and several thousand |
96 | in the other). The Perl extension has now been renamed to be |
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97 | C<Decomposition_Type=Noncanonical> (short: C<dt=noncanon>). It has the same |
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98 | meaning as was previously intended, namely the union of all the |
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99 | non-canonical Decomposition types, with Unicode C<Compat> being just one of |
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100 | those. |
101 | |
102 | C<\p{Uppercase}> and C<\p{Lowercase}> have been brought into line with the |
103 | Unicode definitions. This means they each match a few more characters |
104 | than previously. |
105 | |
106 | C<\p{Cntrl}> now matches the same characters as C<\p{Control}>. This means it |
107 | no longer will match Private Use (gc=co), Surrogates (gc=cs), nor Format |
108 | (gc=cf) code points. The Format code points represent the biggest |
109 | possible problem. All but 36 of them are either officially deprecated |
110 | or strongly discouraged from being used. Of those 36, likely the most |
111 | widely used are the soft hyphen (U+00AD), and BOM, ZWSP, ZWNJ, WJ, and |
112 | similar, plus Bi-directional controls. |
113 | |
114 | C<\p{Alpha}> now matches the same characters as C<\p{Alphabetic}>. The Perl |
115 | definition included a number of things that aren't really alpha (all |
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116 | marks), while omitting many that were. As a direct consequence, the |
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117 | definitions of C<\p{Alnum}> and C<\p{Word}> which depend on Alpha also change. |
118 | |
119 | C<\p{Word}> also now doesn't match certain characters it wasn't supposed |
120 | to, such as fractions. |
121 | |
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122 | C<\p{Print}> no longer matches the line control characters: Tab, LF, CR, |
123 | FF, VT, and NEL. This brings it in line with the documentation. |
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124 | |
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125 | C<\p{Decomposition_Type=Canonical}> now includes the Hangul syllables. |
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126 | |
127 | The Numeric type property has been extended to include the Unihan |
128 | characters. |
129 | |
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130 | There is a new Perl extension, the 'Present_In', or simply 'In', |
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131 | property. This is an extension of the Unicode Age property, but |
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132 | C<\p{In=5.0}> matches any code point whose usage has been determined |
133 | I<as of> Unicode version 5.0. The C<\p{Age=5.0}> only matches code points |
134 | added in I<precisely> version 5.0. |
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135 | |
136 | A number of properties did not have the correct values for unassigned |
137 | code points. This is now fixed. The affected properties are |
138 | Bidi_Class, East_Asian_Width, Joining_Type, Decomposition_Type, |
139 | Hangul_Syllable_Type, Numeric_Type, and Line_Break. |
140 | |
141 | The Default_Ignorable_Code_Point, ID_Continue, and ID_Start properties |
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142 | have been updated to their current Unicode definitions. |
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143 | |
144 | Certain properties that are supposed to be Unicode internal-only were |
145 | erroneously exposed by previous Perls. Use of these in regular |
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146 | expressions will now generate, if enabled, a deprecated warning message. |
147 | The properties are: Other_Alphabetic, Other_Default_Ignorable_Code_Point, |
148 | Other_Grapheme_Extend, Other_ID_Continue, Other_ID_Start, Other_Lowercase, |
149 | Other_Math, and Other_Uppercase. |
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150 | |
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151 | An installation can now fairly easily change which Unicode properties |
152 | Perl understands. As mentioned above, certain properties are by default |
153 | turned off. These include all the Unihan properties (which should be |
154 | accessible via the CPAN module Unicode::Unihan) and any deprecated or |
155 | Unicode internal-only property that Perl has never exposed. |
156 | |
d350938a |
157 | The generated files in the C<lib/unicore/To> directory are now more |
158 | clearly marked as being stable, directly usable by applications. |
159 | New hash entries in them give the format of the normal entries, |
160 | which allows for easier machine parsing. Perl can generate files |
161 | in this directory for any property, though most are suppressed. An |
162 | installation can choose to change which get written. Instructions |
163 | are in L<perluniprops>. |
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164 | |
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165 | =head2 Regular Expressions |
166 | |
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167 | U+0FFFF is now a legal character in regular expressions. |
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168 | |
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169 | =head1 Modules and Pragmata |
170 | |
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171 | =head2 Pragmata Changes |
172 | |
173 | =over 4 |
174 | |
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175 | =item C<constant> |
176 | |
177 | Upgraded from version 1.19 to 1.20. |
178 | |
19185491 |
179 | =item C<diagnostics> |
180 | |
181 | This pragma no longer suppresses C<Use of uninitialized value in range (or flip)> warnings. [perl #71204] |
182 | |
db2ed548 |
183 | =item C<feature> |
184 | |
185 | Upgraded from 1.13 to 1.14. Added the C<unicode_strings> feature: |
186 | |
187 | use feature "unicode_strings"; |
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188 | |
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189 | This pragma turns on Unicode semantics for the case-changing operations |
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190 | (uc/lc/ucfirst/lcfirst) on strings that don't have the internal UTF-8 flag set, |
191 | but that contain single-byte characters between 128 and 255. |
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192 | |
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193 | =item C<legacy> |
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194 | |
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195 | The experimental C<legacy> pragma, introduced in 5.11.2, has been removed, |
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196 | and its functionality replaced by the new feature pragma, C<use feature |
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197 | "unicode_strings">. |
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198 | |
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199 | =item C<threads> |
200 | |
201 | Upgraded from version 1.74 to 1.75. |
202 | |
db2ed548 |
203 | =item C<warnings> |
2e8102e6 |
204 | |
db2ed548 |
205 | Upgraded from 1.07 to 1.08. Added new C<warnings::fatal_enabled()> function. |
09b2a3d2 |
206 | |
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207 | =back |
09b2a3d2 |
208 | |
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209 | =head2 Updated Modules |
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210 | |
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211 | =over 4 |
212 | |
213 | =item C<Archive::Extract> |
214 | |
215 | Upgraded from version 0.34 to 0.36. |
216 | |
217 | =item C<CPAN> |
218 | |
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219 | Upgraded from version 1.94_51 to 1.94_5301, which is 1.94_53 on CPAN |
220 | plus some local fixes for bleadperl. |
1e97cd45 |
221 | |
222 | Includes better bzip2 support, improved FirstTime experience with |
223 | auto-selection of CPAN mirrors, proper handling of modules removed from the |
224 | Perl core, and an updated 'cpan' utility script |
7da18641 |
225 | |
226 | =item C<CPANPLUS> |
227 | |
228 | Upgraded from version 0.89_09 to 0.90. |
229 | |
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230 | =item C<Encode> |
231 | |
232 | Upgraded from version 2.38 to 2.39. |
233 | |
7da18641 |
234 | =item C<ExtUtils::MakeMaker> |
235 | |
6a90494c |
236 | Upgraded from version 6.55_02 to 6.56. Adds new BUILD_REQUIRES key to |
237 | indicate build-only prerequisites. Also adds support for |
238 | mingw64 and the new "package NAME VERSION" syntax. |
7da18641 |
239 | |
240 | =item C<File::Path> |
241 | |
242 | Upgraded from version 2.08 to 2.08_01. |
243 | |
244 | =item C<Module::Build> |
245 | |
6a90494c |
246 | Upgraded from version 0.35_09 to 0.36. Compared to 0.35, this version has a |
247 | new 'installdeps' action, supports the PERL_MB_OPT environment variable, adds a |
248 | 'share_dir' property for L<File::ShareDir> support, support the "package NAME |
249 | VERSION" syntax and has many other enhancements and bug fixes. The |
250 | 'passthrough' style of Module::Build::Compat has been deprecated. |
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251 | |
252 | =item C<Module::CoreList> |
253 | |
254 | Upgraded from version 2.23 to 2.24. |
255 | |
19185491 |
256 | =item C<POSIX> |
257 | |
258 | Upgraded from version 1.18 to 1.19. Error codes for C<getaddrinfo()> and C<getnameinfo()> are now |
259 | available. |
260 | |
7da18641 |
261 | =item C<Pod::Simple> |
262 | |
263 | Upgraded from version 3.10 to 3.13. |
264 | |
265 | =item C<Safe> |
266 | |
267 | Upgraded from version 2.19 to 2.20. |
268 | |
269 | =back |
270 | |
2e8102e6 |
271 | =head1 Utility Changes |
272 | |
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273 | =over 4 |
274 | |
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275 | =item F<perlbug> |
2e8102e6 |
276 | |
db2ed548 |
277 | No longer reports "Message sent" when it hasn't actually sent the message |
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278 | |
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279 | =back |
280 | |
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281 | =head1 Changes to Existing Documentation |
282 | |
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283 | The Pod specification (L<perlpodspec>) has been updated to bring the |
284 | specification in line with modern usage already supported by most Pod systems. |
285 | A parameter string may now follow the format name in a "begin/end" region. |
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286 | Links to URIs with a text description are now allowed. The usage of |
287 | C<LE<lt>"section"E<gt>> has been marked as deprecated. |
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288 | |
289 | L<if.pm|if> has been documented in L<perlfunc/use> as a means to get |
290 | conditional loading of modules despite the implicit BEGIN block around C<use>. |
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291 | |
292 | |
293 | |
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294 | =head1 Installation and Configuration Improvements |
295 | |
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296 | =head2 Testing improvements |
297 | |
298 | =over 4 |
299 | |
300 | =item It's now possible to override C<PERL5OPT> and friends in F<t/TEST> |
301 | |
302 | =back |
303 | |
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304 | =head2 Platform Specific Changes |
305 | |
306 | =over 4 |
307 | |
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308 | =item Win32 |
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309 | |
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310 | =over 4 |
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311 | |
312 | =item * |
313 | |
314 | Always add a manifest resource to C<perl.exe> to specify the <trustInfo> |
315 | settings for Windows Vista and later. Without this setting Windows |
316 | will treat C<perl.exe> as a legacy application and apply various |
317 | heuristics like redirecting access to protected file system areas |
318 | (like the "Program Files" folder) to the users "VirtualStore" |
319 | instead of generating a proper "permission denied" error. |
320 | |
321 | For VC8 and VC9 this manifest setting is automatically generated by |
322 | the compiler/linker (together with the binding information for their |
323 | respective runtime libraries); for all other compilers we need to |
324 | embed the manifest resource explicitly in the external resource file. |
325 | |
326 | This change also requests the Microsoft Common-Controls version 6.0 |
327 | (themed controls introduced in Windows XP) via the dependency list |
328 | in the assembly manifest. For VC8 and VC9 this is specified using the |
329 | C</manifestdependency> linker commandline option instead. |
330 | |
331 | =back |
332 | |
333 | =item cygwin |
334 | |
335 | =over 4 |
336 | |
337 | =item Enable IPv6 support on cygwin 1.7 and newer |
338 | |
339 | =back |
874e3373 |
340 | |
341 | =item OpenVMS |
2e8102e6 |
342 | |
ecb37473 |
343 | =over 4 |
344 | |
345 | =item Make -UDEBUGGING the default on VMS for 5.12.0. |
346 | |
347 | Like it has been everywhere else for ages and ages. Also make |
348 | command-line selection of -UDEBUGGING and -DDEBUGGING work in |
349 | configure.com; before the only way to turn it off was by saying |
350 | no in answer to the interactive question. |
351 | |
2e8102e6 |
352 | =back |
353 | |
1f5724d9 |
354 | =back |
355 | |
2e8102e6 |
356 | =head1 Selected Bug Fixes |
357 | |
2e8102e6 |
358 | =over 4 |
359 | |
360 | =item * |
361 | |
ecb37473 |
362 | Ensure that pp_qr returns a new regexp SV each time. Resolves RT #69852. |
363 | |
364 | Instead of returning a(nother) reference to the (pre-compiled) regexp in the |
365 | optree, use reg_temp_copy() to create a copy of it, and return a reference to |
366 | that. This resolves issues about Regexp::DESTROY not being called in a timely |
367 | fashion (the original bug tracked by RT #69852), as well as bugs related to |
368 | blessing regexps, and of assigning to regexps, as described in correspondence |
369 | added to the ticket. |
370 | |
371 | It transpires that we also need to undo the SvPVX() sharing when ithreads |
372 | cloning a Regexp SV, because mother_re is set to NULL, instead of a cloned |
373 | copy of the mother_re. This change might fix bugs with regexps and threads in |
374 | certain other situations, but as yet neither tests nor bug reports have |
375 | indicated any problems, so it might not actually be an edge case that it's |
376 | possible to reach. |
377 | |
378 | =item * |
379 | |
380 | Several compilation errors and segfaults when perl was built with C<-Dmad> were fixed. |
381 | |
382 | =item * |
383 | |
384 | Fixes for lexer API changes in 5.11.2 which broke NYTProf's savesrc option. |
2e8102e6 |
385 | |
9889e3de |
386 | =item * |
387 | |
388 | F<-t> should only return TRUE for file handles connected to a TTY |
389 | |
390 | The Microsoft C version of isatty() returns TRUE for all |
391 | character mode devices, including the /dev/null style "nul" |
392 | device and printers like "lpt1". |
393 | |
394 | =item * |
395 | |
396 | Fixed a regression caused by commit fafafbaf which caused a panic during parameter passing [perl #70171] |
397 | |
398 | |
399 | =item * |
400 | |
401 | On systems which in-place edits without backup files, -i'*' now works as the documentation says it does [perl #70802] |
402 | |
19185491 |
403 | =item * |
404 | |
fa4ee1ee |
405 | Saving and restoring magic flags no longer loses readonly flag. |
406 | |
407 | =item * |
408 | |
409 | The malformed syntax C<grep EXPR LIST> (note the missing comma) no longer |
410 | causes abrupt and total failure. |
411 | |
412 | =item * |
413 | |
414 | Regular expressions compiled with C<qr{}> literals properly set C<$'> when |
415 | matching again. |
416 | |
417 | =item * |
418 | |
419 | Using named subroutines with C<sort> should no longer lead to bus errors [perl |
420 | #71076] |
421 | |
422 | =item * |
423 | |
19185491 |
424 | Numerous bugfixes catch small issues caused by the recently-added Lexer API. |
425 | |
426 | =item * |
427 | |
e1020413 |
428 | Smart match against C<@_> sometimes gave false negatives. [perl #71078] |
19185491 |
429 | |
430 | =item * |
431 | |
432 | C<$@> may now be assigned a read-only value (without error or busting the stack). |
9889e3de |
433 | |
4656de94 |
434 | =item * |
435 | |
436 | C<sort> called recursively from within an active comparison subroutine no longer causes a bus error if run multiple times. [perl #71076] |
437 | |
2e8102e6 |
438 | =back |
439 | |
440 | =head1 New or Changed Diagnostics |
441 | |
2e8102e6 |
442 | =over 4 |
443 | |
fa4ee1ee |
444 | =item * |
2e8102e6 |
445 | |
fa4ee1ee |
446 | C<split> now warns when called in void context |
2e8102e6 |
447 | |
2e8102e6 |
448 | |
449 | =item * |
450 | |
fa4ee1ee |
451 | C<printf>-style functions called with too few arguments will now issue the warning C<"Missing argument in %s"> [perl #71000] |
452 | |
2e8102e6 |
453 | |
454 | =back |
455 | |
456 | =head1 New Tests |
457 | |
d659d22b |
458 | Many modules updated from CPAN incorporate new tests. |
2e8102e6 |
459 | |
460 | =over 4 |
461 | |
d659d22b |
462 | =item t/comp/final_line_num.t |
2e8102e6 |
463 | |
d659d22b |
464 | See if line numbers are correct at EOF |
465 | |
466 | =item t/comp/form_scope.t |
467 | |
468 | See if format scoping works |
469 | |
470 | =item t/comp/line_debug.t |
471 | |
472 | See if @{"_<$file"} works |
473 | |
474 | =item t/op/filetest_t.t |
475 | |
476 | See if -t file test works |
477 | |
478 | =item t/op/qr.t |
479 | |
480 | See if qr works |
481 | |
482 | =item t/op/utf8cache.t |
483 | |
484 | Tests malfunctions of utf8 cache |
485 | |
486 | =item t/re/uniprops.t |
487 | |
488 | Test unicode \p{} regex constructs |
2e8102e6 |
489 | |
490 | =back |
491 | |
2e8102e6 |
492 | =head1 Deprecations |
493 | |
2e8102e6 |
494 | The following items are now deprecated. |
495 | |
496 | =over 4 |
497 | |
13a4a486 |
498 | =item Use of "goto" to jump into a construct is deprecated |
2e8102e6 |
499 | |
13a4a486 |
500 | Using C<goto> to jump from an outer scope into an inner |
501 | scope is now deprecated. This rare use case was causing |
502 | problems in the implementation of scopes. |
2e8102e6 |
503 | |
504 | =back |
505 | |
2e8102e6 |
506 | =head1 Acknowledgements |
507 | |
d350938a |
508 | Perl 5.11.3 represents approximately one month of development since |
509 | Perl 5.11.2 and contains 61407 lines of changes across 396 files |
510 | from 40 authors and committers: |
511 | |
512 | Abigail, Alex Davies, Alexandr Ciornii, Andrew Rodland, Andy |
513 | Dougherty, Bram, brian d foy, Chip Salzenberg, Chris Williams, Craig |
514 | A. Berry, Daniel Frederick Crisman, David Golden, Dennis Kaarsemaker, |
515 | Eric Brine, Father Chrysostomos, Gene Sullivan, Gerard Goossen, H. |
516 | Merijn Brand, Hugo van der Sanden, Jan Dubois, Jerry D. Hedden, |
517 | Jesse Vincent, Jim Cromie, Karl Williamson, Leon Brocard, Max |
518 | Maischein, Michael Breen, Moritz Lenz, Nicholas Clark, Rafael |
519 | Garcia-Suarez, Reini Urban, Ricardo Signes, Stepan Kasal, Steve |
520 | Hay, Steve Peters, Tim Bunce, Tony Cook, Vincent Pit and Zefram. |
521 | |
522 | Many of the changes included in this version originated in the CPAN |
523 | modules included in Perl's core. We're grateful to the entire CPAN |
524 | community for helping Perl to flourish. |
2e8102e6 |
525 | |
526 | =head1 Reporting Bugs |
527 | |
528 | If you find what you think is a bug, you might check the articles |
529 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
530 | bug database at http://rt.perl.org/perlbug/ . There may also be |
531 | information at http://www.perl.org/ , the Perl Home Page. |
532 | |
533 | If you believe you have an unreported bug, please run the B<perlbug> |
534 | program included with your release. Be sure to trim your bug down |
535 | to a tiny but sufficient test case. Your bug report, along with the |
536 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
537 | analysed by the Perl porting team. |
538 | |
539 | If the bug you are reporting has security implications, which make it |
540 | inappropriate to send to a publicly archived mailing list, then please send |
541 | it to perl5-security-report@perl.org. This points to a closed subscription |
542 | unarchived mailing list, which includes all the core committers, who be able |
543 | to help assess the impact of issues, figure out a resolution, and help |
544 | co-ordinate the release of patches to mitigate or fix the problem across all |
545 | platforms on which Perl is supported. Please only use this address for |
546 | security issues in the Perl core, not for modules independently |
547 | distributed on CPAN. |
548 | |
549 | =head1 SEE ALSO |
550 | |
551 | The F<Changes> file for an explanation of how to view exhaustive details |
552 | on what changed. |
553 | |
554 | The F<INSTALL> file for how to build Perl. |
555 | |
556 | The F<README> file for general stuff. |
557 | |
558 | The F<Artistic> and F<Copying> files for copyright information. |
559 | |
560 | =cut |
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561 | |
562 | |