regexp branch reset changes broke $+

[markov2]

Description
At least in 5.37.8 and 5.37.10 and blead of today, the cooperation between branch reset and $+ is broken.
Very probably related to #20710, but a different effect of the same change.

Steps to Reproduce

  'b' =~ m/ (?| (a) (?{ defined $+ or die "fail!"; print "found $+\n" })
              | (b) (?{ defined $+ or die "fail!"; print "found $+\n" })
            ) /sx;

This should produce "found b", but produces a "fail!"

Perl configuration

 Summary of my perl5 (revision 5 version 37 subversion 10) configuration:
  Commit id: 067d2df440e3814f94fc68e4b8920522362283e8
  Platform:
    osname=linux
    osvers=5.3.18-lp152.98-default
    archname=x86_64-linux
    uname='linux moon 5.3.18-lp152.98-default #1 smp tue nov 2 08:14:49 utc 2021 (d179c1c) x86_64 x86_64 x86_64 gnulinux '
    config_args='-de -Dprefix=/tmp/perl-blead -Dusedevel'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='cc'
    ccflags ='-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='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='7.5.0'
    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 /lib64 /usr/lib64 /lib /usr/local/lib64
    libs=-lpthread -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.26.so
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.26'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl): 
  Compile-time options:
    HAS_TIMES
    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_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under linux
  Compiled at Mar  8 2023 08:43:11

[demerphq]

Thanks, ill investigate later.

Yves

[demerphq]

Thank you for the report. Fixed pushed as #20913