Re: [perl #36622] y/// at end of file

[Rafael Garcia-Suarez]

Michael G Schwern wrote:
 
 Bleadperl appears to have this fixed.  A test is attached.  Ironically
 the fresh_perl test function would always append a newline to the code
 being tested.  I've whacked that out, it was a hold over from the original
 code in t/run/kill_perl.t.

Thanks, applied as change #25252.

Re: [perl #36622] y/// at end of file

[Michael G Schwern]

On Thu, Jul 21, 2005 at 11:45:30AM -0700, Piotr Fusik wrote:
 Among perl golf players, it is widely known that perl doesn't like
 y/// at the very end of a file. So, we put an extra space or newline
 just to make perl happy. Fortunately trailing whitespace doesn't
 count to the score. :-)

First let me say how bonkers I went to get either vim or emacs to stop
putting a newline on the end of a file.  For those emacs out there
the variable is require-final-newline, set it to nil.  Unfortunately all
sorts of modes seem to think they know better and set it to true so even if
you shut it off in your confir you often have to manually set it off.


 If you forget to add something after y///, the error messages are very
 misleading. For example, this program:
 
 #!/usr/bin/perl -0
 INIT{$A{$a}=1while$a=pop}1while@A{/[a-z]+/ig}=~/\B/y/B-ZA-Gb-za/B-ZA
 b-za/
 
 when syntax-checked by perl -c gives the following error message:
 Unrecognized character \x81 at deroter.pl line 2.
 
 (do you see any \x81 here?)

Bleadperl appears to have this fixed.  A test is attached.  Ironically
the fresh_perl test function would always append a newline to the code
being tested.  I've whacked that out, it was a hold over from the original
code in t/run/kill_perl.t.


-- 
Michael G Schwern [EMAIL PROTECTED] http://www.pobox.com/~schwern
Ahh email, my old friend.  Do you know that revenge is a dish that is best 
served cold?  And it is very cold on the Internet!
--- t/test.pl   2005/07/22 18:43:05 1.1
+++ t/test.pl   2005/07/22 18:43:09
@@ -579,7 +579,7 @@
   {if (-e _ and -f _)}
 }
 
-print TEST $prog, \n;
+print TEST $prog;
 close TEST or die Cannot close $tmpfile: $!;
 
 my $results = runperl(%$runperl_args);
--- t/op/tr.t   2005/07/22 18:37:29 1.1
+++ t/op/tr.t   2005/07/22 18:42:16
@@ -6,7 +6,7 @@
 require './test.pl';
 }
 
-plan tests = 99;
+plan tests = 100;
 
 my $Is_EBCDIC = (ord('i') == 0x89  ord('J') == 0xd1);
 
@@ -383,3 +383,7 @@
 $x = \foo;
 is( $x =~ tr/A/A/, 2, 'non-modifying tr/// on a scalar ref' );
 is( ref $x, 'SCALAR', doesn't stringify its argument );
+
+# rt.perl.org 36622.  Perl didn't like a y/// at end of file.  No trailing
+# newline allowed.
+fresh_perl_is(q[$_ = foo; y/A-Z/a-z/], '');

[perl #36622] y/// at end of file

[Piotr Fusik]

# New Ticket Created by  Piotr Fusik 
# Please include the string:  [perl #36622]
# in the subject line of all future correspondence about this issue. 
# URL: https://rt.perl.org/rt3/Ticket/Display.html?id=36622 


This is a bug report for perl from [EMAIL PROTECTED],
generated with the help of perlbug 1.34 running under perl v5.8.0.


-

Among perl golf players, it is widely known that perl doesn't like
y/// at the very end of a file. So, we put an extra space or newline
just to make perl happy. Fortunately trailing whitespace doesn't
count to the score. :-)

If you forget to add something after y///, the error messages are very
misleading. For example, this program:

#!/usr/bin/perl -0
INIT{$A{$a}=1while$a=pop}1while@A{/[a-z]+/ig}=~/\B/y/B-ZA-Gb-za/B-ZA
b-za/

when syntax-checked by perl -c gives the following error message:
Unrecognized character \x81 at deroter.pl line 2.

(do you see any \x81 here?)

I think this should be finally resolved, because it can even crash perl:

#!/usr/bin/perl -0
INIT{%A=map{pop,[EMAIL PROTECTED]@A{/\pL+/g}=~/\B/y/B-ZA-Gb-za/A-z/

when syntax-checked gives a page fault.

It's the same on perl 5.8.0 and 5.8.6.
This report is for 5.8.0, because I have only an executable of 5.8.6.

-
---
Flags:
category=core
severity=medium
---
Site configuration information for perl v5.8.0:

Configured by ActiveState at Mon Mar 31 00:45:28 2003.

Summary of my perl5 (revision 5 version 8 subversion 0) configuration:
  Platform:
osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
uname=''
config_args='undef'
hint=recommended, useposix=true, d_sigaction=undef
usethreads=undef use5005threads=undef useithreads=define
usemultiplicity=define
useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=undef use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
  Compiler:
cc='cl', ccflags
='-nologo -Gf -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_STRICT -D
HAVE_DES_FCRYPT  -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLI
O -DPERL_MSVCRT_READFIX',
optimize='-MD -Zi -DNDEBUG -O1',
cppflags='-DWIN32'
ccversion='', gccversion='', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='__int64',
lseeksize=8
alignbytes=8, prototype=define
  Linker and Libraries:
ld='link', ldflags
'-nologo -nodefaultlib -debug -opt:ref,icf  -libpath:C:\j\Perl\lib\CORE
  -machine:x86'
libpth=D:\Program Files\Microsoft.NET\FrameworkSDK\Lib\
D:\Program Files\Microsoft.Net\Odbc.Net\ C:\j\Perl\lib\CORE
libs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib
netapi32.lib uuid.lib wsock32.lib mpr.lib winmm.lib  version.lib
odbc32.lib odbccp32.lib msvcrt.lib
perllibs=  oldnames.lib kernel32.lib user32.lib gdi32.lib
winspool.lib  comdlg32.lib advapi32.lib shell32.lib ole32.lib
oleaut32.lib  netapi32.lib uuid.lib wsock32.lib mpr.lib winmm.lib
version.lib odbc32.lib odbccp32.lib msvcrt.lib
libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl58.lib
gnulibc_version='undef'
  Dynamic Linking:
dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
cccdlflags=' ',
lddlflags='-dll -nologo -nodefaultlib -debug -opt:ref,icf  -libpath:C:\
j\Perl\lib\CORE  -machine:x86'

Locally applied patches:
ACTIVEPERL_LOCAL_PATCHES_ENTRY

---
@INC for perl v5.8.0:
C:/j/Perl/lib
C:/j/Perl/site/lib
.

---
Environment for perl v5.8.0:
HOME (unset)
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)

PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;C:\U;C:\JAVA\JDK\BIN;C:\C\DJGPP\BIN;C
:\J\PERL\BIN;C:\J\MYSQL\BIN;C:\U\TEXMF\MAIN\MIKTEX\BIN;C:\U\GS\GS8.11\BI
N;C:\C\CYGWIN\BIN;C:\WINDOWS;C:\WINDOWS\COMMAND;C:\U\ANT\BIN
PERL_BADLANG (unset)
SHELL (unset)