Spurious 'Modification of a read-only value'

[p5pRT]

Migrated from rt.perl.org#1736 (status was 'resolved')

Searchable as RT1736$

[p5pRT]

From mjtg@cus.cam.ac.uk

gives the errors

  Useless use of defined operator in void context at -e line 1.
  Modification of a read-only value attempted at -e line 1.

Simpler examples give the expected warnings

  perl -we '${$1}'
  Useless use of a variable in void context at -e line 1.
  Use of uninitialized value at -e line 1.

  perl -we 'defined ${+undef}'
  Useless use of defined operator in void context at -e line 1.
  Use of uninitialized value at -e line 1.

This didn't happen in perl5.003 FWIW. Something to do with
autovivication of references to scalars?

Mike Guy

% perl5.005_62a -V
Summary of my perl5 (revision 5.0 version 5 subversion 62) configuration​:
  Platform​:
  osname=sunos, osvers=4.1.3, archname=sun4-sunos
  uname='sunos nmg1.csi. 4.1.3 1 sun4c '
  config_args='-Doptimise=-O -Uusethreads -des'
  hint=previous, useposix=true, d_sigaction=define
  usethreads=undef useperlio=undef d_sfio=undef
  use64bits=undef usemultiplicity=undef
  Compiler​:
  cc='gcc', optimize='-O', gccversion=2.7.2.3
  cppflags='-I/usr/local/include'
  ccflags ='-I/usr/local/include'
  stdchar='unsigned char', d_stdstdio=define, usevfork=true
  intsize=4, longsize=4, ptrsize=4, doublesize=8
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=8
  alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries​:
  ld='ld', ldflags =' -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib /usr/ucblib
  libs=-ldbm -ldl -lm -lc -lposix
  libc=/lib/libc.so.1.8, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
  cccdlflags='-fpic', lddlflags='-assert nodefinitions -L/usr/local/lib'

Characteristics of this binary (from libperl)​:
  Locally applied patches​:
  perldoc.temp
  install.w
  Built under sunos
  Compiled at Oct 27 1999 01​:31​:39
  @​INC​:
  /home/mjtg/perl5.005_62a/lib
  /home/mjtg/perl5.005_62a/lib
  /home/mjtg/perl5.005_62a/lib/site_perl
  .

[p5pRT]

From [Unknown Contact. See original ticket]

Ooops. Bug [ID 19991103.006] is a resend of [ID 19991103.005].

And it's not the perlbugtron's fault - entirely due to my finger
trouble.

Sorry folks.

Mike Guy