Failure with make check-world for pgtypeslib/dt_test2 with HEAD on OSX

Hi,

This morning while running make check-world on my OSX Mavericks laptop, I
found the following failure:
test pgtypeslib/dt_test2 ... stderr FAILED (test process was
terminated by signal 6: Abort trap)
(lldb) bt
* thread #1: tid = 0x0000, 0x00007fff8052c866
libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGSTOP
* frame #0: 0x00007fff8052c866 libsystem_kernel.dylib`__pthread_kill + 10
frame #1: 0x00007fff83cb035c libsystem_pthread.dylib`pthread_kill + 92
frame #2: 0x00007fff81899bba libsystem_c.dylib`__abort + 145
frame #3: 0x00007fff8189a46d libsystem_c.dylib`__stack_chk_fail + 196
frame #4: 0x000000010f7cb3bb
libpgtypes.3.dylib`PGTYPESdate_from_asc(str=0x000000010f6a2d6c,
endptr=0x00007fff5055e488) + 635 at datetime.c:104
frame #5: 0x000000010f6a260f dt_test2`main + 255 at dt_test2.pgc:91
frame #6: 0x00007fff87acc5fd libdyld.dylib`start + 1
frame #7: 0x00007fff87acc5fd libdyld.dylib`start + 1
Bisecting is showing me that this failure has been introduced by 4318dae,
and is reproducible on all the active branches, down to REL9_0_STABLE.

Note that this problem has been introduced after discussing a separate
issue here:
http://www.postgresql.org/message-id/1399399313.27807.28.camel@sussancws0025
Regards,
--
Michael