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Anythingatall->import gives no error #16540

Open p5pRT opened 6 years ago

p5pRT commented 6 years ago

Migrated from rt.perl.org#133161 (status was 'open')

Searchable as RT133161$

p5pRT commented 6 years ago

From @jimav

This is a bug report for perl from jim.avera@​gmail.com\, generated with the help of perlbug 1.40 running under perl 5.26.1.

  Misspelled->import;

Always silently succeeds.

Shouldn't this cause   Can't locate object method "import" via package "Misspelled" ... ?

Flags​:   category=core   severity=low

Site configuration information for perl 5.26.1​:

Configured by Ubuntu at Sat Mar 10 18​:40​:42 UTC 2018.

Summary of my perl5 (revision 5 version 26 subversion 1) configuration​:  
  Platform​:   osname=linux   osvers=4.9.0   archname=x86_64-linux-gnu-thread-multi   uname='linux localhost 4.9.0 #1 smp debian 4.9.0 x86_64 gnulinux '   config_args='-Dusethreads -Duselargefiles -Dcc=x86_64-linux-gnu-gcc -Dcpp=x86_64-linux-gnu-cpp -Dld=x86_64-linux-gnu-gcc -Dccflags=-DDEBIAN -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/build/perl-5CtO_8/perl-5.26.1=. -fstack-protector-strong -Wformat -Werror=format-security -Dldflags= -Wl\,-Bsymbolic-functions -Wl\,-z\,relro -Dlddlflags=-shared -Wl\,-Bsymbolic-functions -Wl\,-z\,relro -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.26 -Darchlib=/usr/lib/x86_64-linux-gnu/perl/5.26 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/x86_64-linux-gnu/perl5/5.26 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.26.1 -Dsitearch=/usr/local/lib/x86_64-linux-gnu/perl/5.26.1 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Duse64bitint -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Ui_libutil -Ui_xlocale -Uversiononly -DDEBUGGING=-g -Doptimize=-O2 -dEs -Duseshrplib -Dlibperl=libperl.so.5.26.1'   hint=recommended   useposix=true   d_sigaction=define   useithreads=define   usemultiplicity=define   use64bitint=define   use64bitall=define   uselongdouble=undef   usemymalloc=n   default_inc_excludes_dot=define   bincompat5005=undef   Compiler​:   cc='x86_64-linux-gnu-gcc'   ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'   optimize='-O2 -g'   cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include'   ccversion=''   gccversion='7.3.0'   gccosandvers=''   intsize=4   longsize=8   ptrsize=8   doublesize=8   byteorder=12345678   doublekind=3   d_longlong=define   longlongsize=8   d_longdbl=define   longdblsize=16   longdblkind=3   ivtype='long'   ivsize=8   nvtype='double'   nvsize=8   Off_t='off_t'   lseeksize=8   alignbytes=8   prototype=define   Linker and Libraries​:   ld='x86_64-linux-gnu-gcc'   ldflags =' -fstack-protector-strong -L/usr/local/lib'   libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib   libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt   perllibs=-ldl -lm -lpthread -lc -lcrypt   libc=libc-2.27.so   so=so   useshrplib=true   libperl=libperl.so.5.26   gnulibc_version='2.27'   Dynamic Linking​:   dlsrc=dl_dlopen.xs   dlext=so   d_dlsymun=undef   ccdlflags='-Wl\,-E'   cccdlflags='-fPIC'   lddlflags='-shared -L/usr/local/lib -fstack-protector-strong'

Locally applied patches​:   DEBPKG​:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS default for modules installed from CPAN.   DEBPKG​:debian/db_file_ver - https://bugs.debian.org/340047 Remove overly restrictive DB_File version check.   DEBPKG​:debian/doc_info - Replace generic man(1) instructions with Debian-specific information.   DEBPKG​:debian/enc2xs_inc - https://bugs.debian.org/290336 Tweak enc2xs to follow symlinks and ignore missing @​INC directories.   DEBPKG​:debian/errno_ver - https://bugs.debian.org/343351 Remove Errno version check due to upgrade problems with long-running processes.   DEBPKG​:debian/libperl_embed_doc - https://bugs.debian.org/186778 Note that libperl-dev package is required for embedded linking   DEBPKG​:fixes/respect_umask - Respect umask during installation   DEBPKG​:debian/writable_site_dirs - Set umask approproately for site install directories   DEBPKG​:debian/extutils_set_libperl_path - EU​:MM​: set location of libperl.a under /usr/lib   DEBPKG​:debian/no_packlist_perllocal - Don't install .packlist or perllocal.pod for perl or vendor   DEBPKG​:debian/fakeroot - Postpone LD_LIBRARY_PATH evaluation to the binary targets.   DEBPKG​:debian/instmodsh_doc - Debian policy doesn't install .packlist files for core or vendor.   DEBPKG​:debian/ld_run_path - Remove standard libs from LD_RUN_PATH as per Debian policy.   DEBPKG​:debian/libnet_config_path - Set location of libnet.cfg to /etc/perl/Net as /usr may not be writable.   DEBPKG​:debian/perlivp - https://bugs.debian.org/510895 Make perlivp skip include directories in /usr/local   DEBPKG​:debian/deprecate-with-apt - https://bugs.debian.org/747628 Point users to Debian packages of deprecated core modules   DEBPKG​:debian/squelch-locale-warnings - https://bugs.debian.org/508764 Squelch locale warnings in Debian package maintainer scripts   DEBPKG​:debian/patchlevel - https://bugs.debian.org/567489 List packaged patches for 5.26.1-6 in patchlevel.h   DEBPKG​:fixes/document_makemaker_ccflags - https://bugs.debian.org/628522 [rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags}   DEBPKG​:debian/find_html2text - https://bugs.debian.org/640479 Configure CPAN​::Distribution with correct name of html2text   DEBPKG​:debian/perl5db-x-terminal-emulator.patch - https://bugs.debian.org/668490 Invoke x-terminal-emulator rather than xterm in perl5db.pl   DEBPKG​:debian/cpan-missing-site-dirs - https://bugs.debian.org/688842 Fix CPAN​::FirstTime defaults with nonexisting site dirs if a parent is writable   DEBPKG​:fixes/memoize_storable_nstore - [rt.cpan.org #77790] https://bugs.debian.org/587650 Memoize​::Storable​: respect 'nstore' option not respected   DEBPKG​:debian/makemaker-pasthru - https://bugs.debian.org/758471 Pass LD settings through to subdirectories   DEBPKG​:debian/makemaker-manext - https://bugs.debian.org/247370 Make EU​::MakeMaker honour MANnEXT settings in generated manpage headers   DEBPKG​:debian/kfreebsd-softupdates - https://bugs.debian.org/796798 Work around Debian Bug#796798   DEBPKG​:fixes/autodie-scope - https://bugs.debian.org/798096 Fix a scoping issue with "no autodie" and the "system" sub   DEBPKG​:fixes/memoize-pod - [rt.cpan.org #89441] Fix POD errors in Memoize   DEBPKG​:debian/hurd-softupdates - https://bugs.debian.org/822735 Fix t/op/stat.t failures on hurd   DEBPKG​:fixes/math_complex_doc_great_circle - https://bugs.debian.org/697567 [rt.cpan.org #114104] Math​::Trig​: clarify definition of great_circle_midpoint   DEBPKG​:fixes/math_complex_doc_see_also - https://bugs.debian.org/697568 [rt.cpan.org #114105] Math​::Trig​: add missing SEE ALSO   DEBPKG​:fixes/math_complex_doc_angle_units - https://bugs.debian.org/731505 [rt.cpan.org #114106] Math​::Trig​: document angle units   DEBPKG​:fixes/cpan_web_link - https://bugs.debian.org/367291 CPAN​: Add link to main CPAN web site   DEBPKG​:fixes/time_piece_doc - https://bugs.debian.org/817925 Time​::Piece​: Improve documentation for add_months and add_years   DEBPKG​:fixes/extutils_makemaker_reproducible - https​://bugs.debian.org/835815 https://bugs.debian.org/834190 Make perllocal.pod files reproducible   DEBPKG​:fixes/file_path_hurd_errno - File-Path​: Fix test failure in Hurd due to hard-coded ENOENT   DEBPKG​:debian/hppa_op_optimize_workaround - https://bugs.debian.org/838613 Temporarily lower the optimization of op.c on hppa due to gcc-6 problems   DEBPKG​:debian/installman-utf8 - https://bugs.debian.org/840211 Generate man pages with UTF-8 characters   DEBPKG​:fixes/file_path_chmod_race - https://bugs.debian.org/863870 [rt.cpan.org #121951] Prevent directory chmod race attack.   DEBPKG​:fixes/extutils_file_path_compat - Correct the order of tests of chmod(). (#294)   DEBPKG​:fixes/getopt-long-2 - [rt.cpan.org #120300] Withdraw part of commit 5d9947fb445327c7299d8beb009d609bc70066c0\, which tries to implement more GNU getopt_long campatibility. GNU   DEBPKG​:fixes/getopt-long-3 - provide a default value for optional arguments   DEBPKG​:fixes/getopt-long-4 - https://bugs.debian.org/864544 [rt.cpan.org #122068] Fix issue #122068.   DEBPKG​:fixes/test-builder-reset - https://bugs.debian.org/865894 Reset inside subtest maintains parent   DEBPKG​:debian/hppa_opmini_optimize_workaround - https://bugs.debian.org/869122 Lower the optimization level of opmini.c on hppa   DEBPKG​:debian/sh4_op_optimize_workaround - https://bugs.debian.org/869373 Also lower the optimization level of op.c and opmini.c on sh4   DEBPKG​:fixes/json-pp-example - [rt.cpan.org #92793] https://bugs.debian.org/871837 fix RT-92793​: bug in SYNOPSIS   DEBPKG​:debian/perldoc-pager - https://bugs.debian.org/870340 [rt.cpan.org #120229] Fix perldoc terminal escapes when sensible-pager is less   DEBPKG​:debian/prune_libs - https://bugs.debian.org/128355 Prune the list of libraries wanted to what we actually need.   DEBPKG​:debian/configure-regen - https://bugs.debian.org/762638 Regenerate Configure et al. after probe unit changes   DEBPKG​:fixes/rename-filexp.U-phase1 - regen-configure​: rename filexp.U to filexp_path.U\, phase 1   DEBPKG​:fixes/rename-filexp.U-phase2 - regen-configure​: rename filexp.U to filexp_path.U\, phase 2   DEBPKG​:fixes/packaging_test_skips - Skip various tests if PERL_BUILD_PACKAGING is set   DEBPKG​:debian/mod_paths - Tweak @​INC ordering for Debian   DEBPKG​:fixes/encode-alias-regexp - https​://bugs.debian.org/880085 fix https://github.com/dankogai/p5-encode/issues/127   DEBPKG​:fixes/regex-memory-leak - [910a6a8] https://bugs.debian.org/891196 [perl #132892] perl #132892​: avoid leak by mortalizing temporary copy of pattern   DEBPKG​:fixes/CVE-2018-6797 - [perl #132227] (perl #132227) restart a node if we change to uni rules within the node and encounter a sharp S   DEBPKG​:fixes/CVE-2018-6798/pt1 - [perl #132063] Heap buffer overflow   DEBPKG​:fixes/CVE-2018-6798/pt2 - [perl #132063] 5.26.1​: fix TRIE_READ_CHAR and DECL_TRIE_TYPE to account for non-utf8 target   DEBPKG​:fixes/CVE-2018-6798/pt3 - [perl #132063] (perl #132063) we should no longer warn for this code   DEBPKG​:fixes/CVE-2018-6798/pt4 - [perl #132063] utf8.c​: Don't dump malformation past first NUL   DEBPKG​:fixes/CVE-2018-6913 - [perl #131844] (perl #131844) fix various space calculation issues in pp_pack.c

@​INC for perl 5.26.1​:   /home/jima/lib/perl   /home/jima/perl5/lib/perl5/x86_64-linux-gnu-thread-multi   /home/jima/perl5/lib/perl5/5.26.1/x86_64-linux-gnu-thread-multi   /home/jima/perl5/lib/perl5/5.26.1   /home/jima/perl5/lib/perl5/x86_64-linux-gnu-thread-multi   /home/jima/perl5/lib/perl5   /etc/perl   /usr/local/lib/x86_64-linux-gnu/perl/5.26.1   /usr/local/share/perl/5.26.1   /usr/lib/x86_64-linux-gnu/perl5/5.26   /usr/share/perl5   /usr/lib/x86_64-linux-gnu/perl/5.26   /usr/share/perl/5.26   /home/jima/perl5/lib/perl5/5.26.0   /home/jima/perl5/lib/perl5/5.26.0/x86_64-linux-gnu-thread-multi   /usr/local/lib/site_perl   /usr/lib/x86_64-linux-gnu/perl-base

Environment for perl 5.26.1​:   HOME=/home/jima   LANG=en_US.UTF-8   LANGUAGE (unset)   LC_COLLATE=C   LD_LIBRARY_PATH (unset)   LOGDIR (unset)   PATH=/home/jima/.local/bin​:/home/jima/perl5/bin​:/bin​:/home/jima/bin​:/home/jima/jima_tools/x86_64/bin​:/home/jima/jima_tools/bin​:/usr/bin​:/usr/sbin​:/sbin​:/usr/bin/X11​:/usr/local/bin​:/usr/local/sbin​:/usr/games​:/usr/local/games​:/snap/bin​:/usr/lib/jvm/java-8-oracle/bin​:/usr/lib/jvm/java-8-oracle/db/bin​:/usr/lib/jvm/java-8-oracle/jre/bin​:.   PERL5LIB=/home/jima/lib/perl​:/home/jima/perl5/lib/perl5/x86_64-linux-gnu-thread-multi​:/home/jima/perl5/lib/perl5   PERL_BADLANG (unset)   PERL_LOCAL_LIB_ROOT=/home/jima/perl5   PERL_MB_OPT=--install_base /home/jima/perl5   PERL_MM_OPT=INSTALL_BASE=/home/jima/perl5   SHELL=/bin/bash

p5pRT commented 6 years ago

From @grinnz

On Sun\, Apr 29\, 2018 at 10​:34 PM\, Jim Avera (via RT) \< perlbug-followup@​perl.org> wrote​:

     Misspelled\->import;

Always silently succeeds.

Shouldn't this cause Can't locate object method "import" via package "Misspelled" ... ?

The import method is special cased to do nothing when it doesn't exist\, in order for "use" to not throw errors when a package doesn't implement it. Interestingly\, methods in UNIVERSAL also don't end up throwing errors since they just use the default implementation even if the package doesn't exist.

Foo->DOES('Foo') # 1 Foo->can('can') # returns a coderef

-Dan

p5pRT commented 6 years ago

The RT System itself - Status changed from 'new' to 'open'

p5pRT commented 6 years ago

From @jimav

AFAIK this is not documented (the docs say there is absolutely nothing special about 'import').

Maybe this should be mentioned in perlmod.

-Jim

On 4/29/18 10​:07 PM\, Dan Book via RT wrote​:

On Sun\, Apr 29\, 2018 at 10​:34 PM\, Jim Avera (via RT) \< perlbug-followup@​perl.org> wrote​:

      Misspelled\->import;

Always silently succeeds.

Shouldn't this cause Can't locate object method "import" via package "Misspelled" ... ?

The import method is special cased to do nothing when it doesn't exist\, in order for "use" to not throw errors when a package doesn't implement it. Interestingly\, methods in UNIVERSAL also don't end up throwing errors since they just use the default implementation even if the package doesn't exist.

Foo->DOES('Foo') # 1 Foo->can('can') # returns a coderef

-Dan