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Perl 5.24

• New features:
  • Unicode 8.0 is now supported.
  • An exception will be raised when closing an in-place output file fails.
  • (?[ ]) will successfully compile when use locale is in effect.
  • Integer shift (<< and >>) now more explicitly defined. Negative shifts are reverse shifts.
  • printf and sprintf now allow reordered precision arguments.
  • When passing the SA_SIGINFO flag to sigaction, the errno, status, uid, pid, addr and band fields are included in the hash passed to the handler, if supported by the platform.
  • Hashbang redirection was extended also to Perl 6.

• Changes:
  • Postfix dereferencing is no longer experimental.
  • Remove duplicate environment variables from environ.
  • More regular expression patterns are now checked for validity at compilation time, and invalid ones will cause the program to not compile.
  • Using \N{} is a fatal error under experimental feature "'strict' mode" in re.
  • A my, our, or state declaration is no longer allowed inside of another my, our, or state declaration.
  • The /\C/ character class has been removed.
  • Using chdir(\'\') or chdir(undef) to change working directory to a home directory fails now. Use chdir() instead.
  • ASCII characters in variable names must now be all visible.
  • $Carp::MaxArgNums is supposed to be the number of arguments to display.
  • Only blanks and tabs are now allowed within [...] within (?[...]).
  • Matching fixed string regular expression is now faster in most cases.

• Removed features:
  • The autoderef feature has been removed.
  • Lexical $_ has been removed.
  • PPPort.so no longer get installed, as they are not used by PPPort.pm.
  • Using code points above the platform's IV_MAX is now deprecated.
  • Bitwise operations on strings containing code points above 0xFF is deprecated. Instead, encode these strings to byte strings first.
  • sysread(), syswrite(), recv() and send() are deprecated on :utf8 handles.