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bad interaction between 'next' and raw scope levels #1086

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p5pRT opened this issue Jan 25, 2000 · 3 comments
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bad interaction between 'next' and raw scope levels #1086

p5pRT opened this issue Jan 25, 2000 · 3 comments
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distro-Solaris documentation

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@p5pRT
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p5pRT commented Jan 25, 2000

Migrated from rt.perl.org#2039 (status was 'resolved')

Searchable as RT2039$
@p5pRT
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p5pRT commented Jan 25, 2000

From jcox@newton.interwoven.com

#==============================================================
#==============================================================
#
# Both loops below should output
#
# index​: 0
# index​: 2
#
# But the 1st loop outputs
#
# index​: 0
# index​: 1
# index​: 2
#
# This is wrong, since a raw scope is not loop structure
# (ie​: if/while/foreach...).
#
#
# Sincerely,
# - Jon
# <jcox@​interwoven.com>
#
#==============================================================
#==============================================================

print "\nThe following loops should have the same output -- but they don't!\n";
print "\n\n'next' inside an empty scope within a 'for' loop\n";

for (my $i=0; $i<3; $i++)
{
  { # new "raw" scoping level
  if ($i == 1)
  {
  next; # executes, but does not skip
  } # the print statement! Boo hoo!
  }
  print "index​: $i\n";
}

print "\n\n'next' inside an 'if' within a 'for' loop\n";

for (my $i=0; $i<3; $i++)
{
  if (1)
  { # new scope bound to the "if(1)"
  if ($i == 1)
  {
  next; # correctly skips the print statement
  }
  }
  print "index​: $i\n";
}

Perl Info 


Site configuration information for perl 5.00502:

Configured by jcox at Mon Dec  7 18:01:13 PST 1998.

Summary of my perl5 (5.0 patchlevel 5 subversion 2) configuration:
  Platform:
    osname=solaris, osvers=2.6, archname=sun4-solaris
    uname='sunos newton 5.6 generic_105181-07 sun4u sparc sunw,ultrasparc-iii-engine '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='gcc', optimize='-O', gccversion=2.8.1
    cppflags='-I/usr/local/include'
    ccflags ='-I/usr/local/include'
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc -lcrypt
    libc=/lib/libc.so, so=so, useshrplib=true, libperl=libperl.so
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='  -R /usr/local/lib/perl5/5.00502/sun4-solaris/CORE'
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00502:
    /usr/local/lib/perl5/5.00502/sun4-solaris
    /usr/local/lib/perl5/5.00502
    /usr/local/lib/perl5/site_perl/5.005/sun4-solaris
    /usr/local/lib/perl5/site_perl/5.005
    .


Environment for perl 5.00502:
    HOME=/net/stargate/d2/iw/jcox
    LANG (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=.:/usr/local/microsoft/bin:/opt/SUNWspro/bin:/usr/ucb:/net/stargate/d2/iw/jcox/bin/sol:/net/stargate/d2/iw/jcox/bin:/sbin:/bin:/usr/bin:/usr/local/bin:/usr/sbin:/usr/ccs/bin:/usr/openwin/bin:/etc:/usr/etc:/usr/local/etc:/usr/local/jcoxstuff/iw-home/bin:~jcox/bin
    PERL_BADLANG (unset)
    SHELL=/net/stargate/d2/iw/jcox/bin/zsh

@p5pRT
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p5pRT commented Jan 25, 2000

From @tamias

On Tue, Jan 25, 2000 at 09​:49​:52PM -0800, Jonathan Cox wrote​:

for (my $i=0; $i<3; $i++)
{
{ # new "raw" scoping level
if ($i == 1)
{
next; # executes, but does not skip
} # the print statement! Boo hoo!
}
print "index​: $i\n";
}

As documented in perlsyn. Bare blocks, with optional labels, are loops
that execute once. Loop control statements apply to them.

Ronald

@p5pRT
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p5pRT commented Jan 26, 2000

From @TimToady

Jonathan Cox writes​:
: # This is wrong, since a raw scope is not loop structure

Er, yes it is, in this case. A bare block is defined to be a loop that
executes once.

Larry

@p5pRT p5pRT closed this as completed Nov 28, 2003
@p5pRT p5pRT mentioned this issue Oct 19, 2019
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