cpan安裝開關失敗

Question

我是新手，並學習Perl編程。 我對cpan感到困惑，我知道有數千個支持perl的庫，但是，如何從cpan安裝庫？ 我在Linux中使用cpan時，當我嘗試安裝開關時，出現錯誤消息

cpan[1]> install Switch

和安裝時出現錯誤：

Reading '/root/.cpan/Metadata'
Database was generated on Mon, 13 Jan 2014 08:29:02 GMT
Running install for module 'Switch'
Running make for R/RG/RGARCIA/Switch-2.16.tar.gz
Checksum for /root/.cpan/sources/authors/id/R/RG/RGARCIA/Switch-2.16.tar.gz ok
Scanning cache /root/.cpan/build for sizes
............................................................................DONE

  CPAN.pm: Building R/RG/RGARCIA/Switch-2.16.tar.gz

Checking if your kit is complete...
Looks good
Writing Makefile for Switch
Writing MYMETA.yml and MYMETA.json
cp Switch.pm blib/lib/Switch.pm
Manifying blib/man3/Switch.3
  RGARCIA/Switch-2.16.tar.gz
  /usr/bin/make -- OK
'YAML' not installed, will not store persistent state
Running make test
PERL_DL_NONLAZY=1 /usr/bin/perl5.18.1 "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/given.t ... Failed 2/293 subtests 
t/nested.t .. ok   
t/switch.t .. ok       

Test Summary Report
-------------------
t/given.t (Wstat: 0 Tests: 293 Failed: 2)
  Failed tests:  2-3
Files=3, Tests=590,  4 wallclock secs ( 0.31 usr  0.01 sys +  2.38 cusr  0.03 csys =  2.73 CPU)
Result: FAIL
Failed 1/3 test programs. 2/590 subtests failed.
make: *** [test_dynamic] Error 255
  RGARCIA/Switch-2.16.tar.gz
  /usr/bin/make test -- NOT OK
//hint// to see the cpan-testers results for installing this module, try:
  reports RGARCIA/Switch-2.16.tar.gz
Running make install
  make test had returned bad status, won't install without force
Failed during this command:
 RGARCIA/Switch-2.16.tar.gz                   : make_test NO

如何安裝開關？ 謝謝

Answer 1

您所做的一切都正確，但是在Perl 5.13.3及更高版本上 Switch 損壞了 。 模塊的維護者知道此問題，並且似乎對解決此問題不感興趣。 考慮到模塊的維護不力，即使您確實說服了它進行安裝，在生產代碼中似乎也不建議使用它。

最近在PerlMonks上進行的一些相關討論，討論了類似開關的構造：

• Smartmatch替代品
• perldata不清楚“給定的命運”