From @mjdominus

print scalar x 10;

-e syntax OK

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration​:
  Platform​:
  osname=linux, osvers=2.2.16, archname=i586-linux
  uname='linux plover 2.2.16 #97 fri jun 16 19​:45​:30 pdt 2000 i586 unknown '
  config_args='-Doptimize=-g -des'
  hint=recommended, useposix=true, d_sigaction=define
  usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
  useperlio=undef d_sfio=undef uselargefiles=define
  use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler​:
  cc='cc', optimize='-g', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
  cppflags='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include'
  ccflags ='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
  stdchar='char', d_stdstdio=define, usevfork=false
  intsize=4, longsize=4, ptrsize=4, doublesize=8
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
  ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib
  libs=-lnsl -lndbm -lgdbm -ldb -ldl -lm -lc -lposix -lcrypt
  libc=/lib/libc-2.1.3.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
  cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Characteristics of this binary (from libperl)​:
  Compile-time options​: DEBUGGING USE_LARGE_FILES
  Built under linux
  Compiled at Sep 20 2000 15​:38​:35
  @​INC​:
  /usr/local/lib/perl5/5.6.0/i586-linux
  /usr/local/lib/perl5/5.6.0
  /usr/local/lib/perl5/site_perl/5.6.0/i586-linux
  /usr/local/lib/perl5/site_perl/5.6.0
  /usr/local/lib/perl5/site_perl
  .

From @mjdominus

print scalar x 10;

-e syntax OK

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration​:
  Platform​:
  osname=linux, osvers=2.2.16, archname=i586-linux
  uname='linux plover 2.2.16 #97 fri jun 16 19​:45​:30 pdt 2000 i586 unknown '
  config_args='-Doptimize=-g -des'
  hint=recommended, useposix=true, d_sigaction=define
  usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
  useperlio=undef d_sfio=undef uselargefiles=define
  use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler​:
  cc='cc', optimize='-g', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
  cppflags='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include'
  ccflags ='-DDEBUGGING -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
  stdchar='char', d_stdstdio=define, usevfork=false
  intsize=4, longsize=4, ptrsize=4, doublesize=8
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
  ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib
  libs=-lnsl -lndbm -lgdbm -ldb -ldl -lm -lc -lposix -lcrypt
  libc=/lib/libc-2.1.3.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
  cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Characteristics of this binary (from libperl)​:
  Compile-time options​: DEBUGGING USE_LARGE_FILES
  Built under linux
  Compiled at Sep 20 2000 15​:38​:35
  @​INC​:
  /usr/local/lib/perl5/5.6.0/i586-linux
  /usr/local/lib/perl5/5.6.0
  /usr/local/lib/perl5/site_perl/5.6.0/i586-linux
  /usr/local/lib/perl5/site_perl/5.6.0
  /usr/local/lib/perl5/site_perl
  .

From @cwest

perl -MO=Deparse -e'print scalar($_) x 10;'
print scalar($_) x 10;
-e syntax OK

Without the parens or argument, warnings are issued.

@cwest - Status changed from 'open' to 'resolved'