$ valgrind --leak-check=full /usr/local/debugperl/bin/perl -e1
==5028== Memcheck, a memory error detector.
==5028== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.
==5028== Using LibVEX rev 1471, a library for dynamic binary translation.
==5028== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP.
==5028== Using valgrind-3.1.0, a dynamic binary instrumentation framework.
==5028== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al.
==5028== For more details, rerun with: -v
==5028== 
==5028== 
==5028== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 21 from 1)
==5028== malloc/free: in use at exit: 127 bytes in 16 blocks.
==5028== malloc/free: 644 allocs, 628 frees, 74,906 bytes allocated.
==5028== For counts of detected errors, rerun with: -v
==5028== searching for pointers to 16 not-freed blocks.
==5028== checked 288,268 bytes.
==5028== 
==5028== 127 bytes in 16 blocks are definitely lost in loss record 1 of 1
==5028==    at 0x401A619: malloc (vg_replace_malloc.c:149)
==5028==    by 0x80B1EFE: Perl_safesysmalloc (util.c:78)
==5028==    by 0x80B3343: Perl_savepvn (util.c:789)
==5028==    by 0x8068DD9: Perl_gv_fetchpv (gv.c:754)
==5028==    by 0x8065045: S_init_main_stash (perl.c:3510)
==5028==    by 0x8061650: S_parse_body (perl.c:1657)
==5028==    by 0x8061465: perl_parse (perl.c:1598)
==5028==    by 0x805E9E8: main (perlmain.c:97)
==5028== 
==5028== LEAK SUMMARY:
==5028==    definitely lost: 127 bytes in 16 blocks.
==5028==      possibly lost: 0 bytes in 0 blocks.
==5028==    still reachable: 0 bytes in 0 blocks.
==5028==         suppressed: 0 bytes in 0 blocks.
==5028== Reachable blocks (those to which a pointer was found) are not shown.
==5028== To see them, rerun with: --show-reachable=yes
$