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WARNING section of perlobj misleading #387

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p5pRT opened this issue Aug 16, 1999 · 1 comment
Closed

WARNING section of perlobj misleading #387

p5pRT opened this issue Aug 16, 1999 · 1 comment

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@p5pRT
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p5pRT commented Aug 16, 1999

Migrated from rt.perl.org#1222 (status was 'resolved')

Searchable as RT1222$

@p5pRT
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p5pRT commented Aug 16, 1999

From adam@thelonious.new.ox.ac.uk

The WARNING section of perlobj discusses certain examples of
misleading syntax, including the line​:

  move $ary[$i]; # probably wrong!

According to the man page,

  Those actually parse as the very surprising​:

[sniplet]

  $ary->move->[$i]; # Didn't expect this one, eh?

However, according to a quick -MO=Deparse, it actually parses as

  @​ary->move([0]);

which results in the error​:

  Can't call method "foo" on an undefined value at -e line 1.

and is presumably undefined behaviour anyway?

P.S. This also applies for 5.00503, despite me perlbugging this on a
5.00502 - the RedHat 6.0 RPM for perl is missing perlbug (yes, I
submitted this problem to their bugzilla).

Perl Info


Site configuration information for perl 5.00502:

Configured by adam at Fri Aug 21 13:57:21 BST 1998.

Summary of my perl5 (5.0 patchlevel 5 subversion 2) configuration:
  Platform:
    osname=linux, osvers=2.1.109, archname=i686-linux-thread
    uname='linux thelonious.new.ox.ac.uk 2.1.109 #3 smp fri jul 17 18:36:33 bst 1998 i686 unknown '
    hint=previous, useposix=true, d_sigaction=define
    usethreads=define useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=2.7.2.3
    cppflags='-D_REENTRANT -Dbool=char -DHAS_BOOL'
    ccflags ='-D_REENTRANT -Dbool=char -DHAS_BOOL -DDEBUGGING'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =''
    libpth=/lib /usr/lib
    libs=-lnsl -lndbm -lgdbm -ldb -ldl -lm -lpthread -lc -lposix -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared'

Locally applied patches:
    


@INC for perl 5.00502:
    /PACK/perl/5.005_02/lib/5.00502/i686-linux-thread
    /PACK/perl/5.005_02/lib/5.00502
    /PACK/perl/5.005_02/lib/site_perl/5.005/i686-linux-thread
    /PACK/perl/5.005_02/lib/site_perl/5.005
    .


Environment for perl 5.00502:
    HOME=/home/adam
    LANG (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/adam/bin:/home/adam/packbin:/usr/bin:/bin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/adam/bin
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/zsh

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