[ID 20000425.009] bug report

This is a bug report for perl from lr@hpl.hp.com,
generated with the help of perlbug 1.28 running under perl v5.6.0.


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[Please enter your report here]

When a scalar that has a numerical value is assigned a constructed
string that evaluates to a numerical value, the previous numerical
value is sometimes not invalidated.

e:\> perl -e "my $x = 10; $x = '2' . $x; print $x + 0"
10

Any simple calculation that produces a wrong value quietly is
potentially a serious problem and should be addressed.  I called
its severity 'medium' because Perl has survived this far without
exploding any nuclear reactors.  :-)

[Please do not change anything below this line]
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---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.6.0:

Summary of my perl5 (revision 5 version 6 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=undef d_sfio=undef uselargefiles=undef 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='cl', optimize='-O1 -MD -DNDEBUG', gccversion=
    cppflags='-DWIN32'
    ccflags ='-O1 -MD -DNDEBUG -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT  -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='link', ldflags ='-nologo -nodefaultlib -release  -libpath:"C:\Perl\lib\CORE"  -machine:x86'
    libpth="C:\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
    libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl56.lib
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -release  -libpath:"C:\Perl\lib\CORE"  -machine:x86'

Locally applied patches:
    ACTIVEPERL_LOCAL_PATCHES_ENTRY

---
@INC for perl v5.6.0:
    C:/Perl/lib
    C:/Perl/site/lib
    .

---
Environment for perl v5.6.0:
    HOME=C:\
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=C:\WINDOWS;c:\windows;c:\windows\COMMAND;C:\PERL\BIN\;C:\WINDOWS;C:\WINDOWS\COMMAND;C:\MKSNT;C:\VIM\VIM55
    PERL_BADLANG (unset)
    SHELL=C:\command.com

• [ID 20000425.009] bug report by Larry Rosler
• Re: [ID 20000425.009] bug report by simon
• Re: [ID 20000425.009] bug report by Joshua N Pritikin
• Re: [ID 20000425.009] bug report by simon.p.cozens
• Re: [ID 20000425.009] bug report by simon.p.cozens
• Re: [ID 20000425.009] bug report by M.J.T. Guy