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Strange interaction with locale and late loading Encode module #21746

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@ailin-nemui

Description

@ailin-nemui

Module:

Description

Trying to use Encode after POSIX::setlocale has been changed to Polish, causes the following error:

Constants from lexical variables potentially modified elsewhere are no longer permitted at constant.pm line 41.
BEGIN failed--compilation aborted at constant.pm line 45.
Compilation failed in require at Encode.pm line 7.
BEGIN failed--compilation aborted at Encode.pm line 7.

Steps to Reproduce

(in case you have any of that set)

unset LC_ALL LC_CTYPE LC_COLLATE LC_MESSAGES LC_MONETARY LC_NUMERIC LC_TIME LC_ADDRESS LC_IDENTIFICATION LC_MEASUREMENT LC_NAME LC_PAPER LC_TELEPHONE
LANG=pl_PL.UTF-8 perl -E'
   BEGIN{
      use POSIX;
      setlocale(LC_ALL,"")
   }
   use Encode
'

you can also get the same error with:

LANG=pl_PL.utf8 perl -MPOSIX -E'
   setlocale(LC_ALL,"");
   eval q{
      use constant X => $]
   };
   print $@
'

Expected behavior

use Encode should not crash depending on the locale

Perl configuration

Summary of my perl5 (revision 5 version 39 subversion 6) configuration:
  Snapshot of: c5f88297e0985be19f66e995b527ee4a001fc028
  Platform:
    osname=linux
    osvers=6.6.3-1-default
    archname=x86_64-linux-thread-multi
    uname='linux d5421s.localdomain 6.6.3-1-default #1 smp preempt_dynamic wed nov 29 05:06:07 utc 2023 (d766c57) x86_64 x86_64 x86_64 gnulinux '
    config_args='-de -Dprefix=~/perl5/perlbrew/perls/perl-blead -Duseshrplib -Dusethreads -Dusemultiplicity -Dusedevel -Aeval:scriptdir=~/perl5/perlbrew/perls/perl-blead/bin'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=define
    usemultiplicity=define
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='cc'
    ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2'
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='13.2.1 20231130 [revision 741743c028dc00f27b9c8b1d5211c1f602f2fddd]'
    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='cc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/x86_64-suse-linux/lib /usr/lib /usr/lib64 /usr/local/lib64
    libs=-lpthread -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
    libc=/lib/../lib64/libc.so.6
    so=so
    useshrplib=true
    libperl=libperl.so
    gnulibc_version='2.38'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E -Wl,-rpath,~/perl5/perlbrew/perls/perl-blead/lib/5.39.6/x86_64-linux-thread-multi/CORE'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl): 
  Compile-time options:
    HAS_LONG_DOUBLE
    HAS_STRTOLD
    HAS_TIMES
    MULTIPLICITY
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_HASH_FUNC_SIPHASH13
    PERL_HASH_USE_SBOX32
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_DEVEL
    PERL_USE_SAFE_PUTENV
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_ITHREADS
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
    USE_REENTRANT_API
    USE_THREAD_SAFE_LOCALE
  Built under linux
  Compiled at Dec 22 2023 14:39:29
  %ENV:
    PERLBREW_HOME="~/.perlbrew"
    PERLBREW_MANPATH="~/perl5/perlbrew/perls/perl-blead/man"
    PERLBREW_PATH="~/perl5/perlbrew/bin:~/perl5/perlbrew/perls/perl-blead/bin"
    PERLBREW_PERL="perl-blead"
    PERLBREW_ROOT="~/perl5/perlbrew"
    PERLBREW_SHELLRC_VERSION="0.98"
    PERLBREW_VERSION="0.98"
    PERLDOC_PAGER="less -s"
    PERL_LOCAL_LIB_ROOT="~/perl5/5.38.2"
    PERL_MB_OPT="--install_base "~/perl5/5.38.2""
    PERL_MM_OPT="INSTALL_BASE=~/perl5/5.38.2"
  @INC:
    ~/perl5/perlbrew/perls/perl-blead/lib/site_perl/5.39.6/x86_64-linux-thread-multi
    ~/perl5/perlbrew/perls/perl-blead/lib/site_perl/5.39.6
    ~/perl5/perlbrew/perls/perl-blead/lib/5.39.6/x86_64-linux-thread-multi
    ~/perl5/perlbrew/perls/perl-blead/lib/5.39.6

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