Debug output when running the attached code:

2017-12-11 20:07:47.504 RunTest[10350:10350] Starting test
2017-12-11 20:07:47.504 RunTest[10350:10350] Starting poke
2017-12-11 20:07:47.504 RunTest[10350:10350] Finally cause - poking
Throwing 0x14d71a0
New personality function called 0x14de2f0
Class: GNUCOBJC
LSDA: 0x403b1c
Search phase...
Filter: 1
Class name: NSException
0x7fc9e46cbde8 type: 1
found handler for NSException
handler: 4
Found handler! 4
New personality function called 0x14de2f0
Class: GNUCOBJC
LSDA: 0x403b1c
Phase 2: Fight!
Installing context, selector 1
Beginning catch 0x14de2f0
objc catch
Throwing 0x14d71a0
New personality function called 0x14de350
Class: GNUCOBJC
LSDA: 0x403b1c
Search phase...
handler: 1
New personality function called 0x14de350
Class: GNUCOBJC
LSDA: 0x403b1c
Phase 2: Fight!
Not the handler frame, looking up the cleanup again
handler! 1 0
Installing cleanup...
Installing context, selector 0
Ending catch
New personality function called 0x14de350
Class: GNUCOBJC
LSDA: 0x403b1c
Phase 2: Fight!
Not the handler frame, looking up the cleanup again
2017-12-11 20:07:47.505 RunTest[10350:10350] Caught ObjC exception
2017-12-11 20:07:47.505 RunTest[10350:10350] Running the finally section
2017-12-11 20:07:47.505 RunTest[10350:10350] Starting poke
2017-12-11 20:07:47.505 RunTest[10350:10350] Finally cause - poking
Throwing 0x14de470
New personality function called 0x14de620
Class: GNUCOBJC
LSDA: 0x403b1c
Search phase...
Filter: 1
Class name: NSException
0x7fc9e46cbde8 type: 1
found handler for NSException
handler: 4
Found handler! 4
New personality function called 0x14de620
Class: GNUCOBJC
LSDA: 0x403b1c
Phase 2: Fight!
Installing context, selector 1
Beginning catch 0x14de620
objc catch
Throwing 0x14de470
New personality function called 0x14de680
Class: GNUCOBJC
LSDA: 0x403b1c
Search phase...
handler: 1
New personality function called 0x14de680
Class: GNUCOBJC
LSDA: 0x403b1c
Phase 2: Fight!
Not the handler frame, looking up the cleanup again
handler! 1 0
Installing cleanup...
Installing context, selector 0
Ending catch
New personality function called 0x14de680
Class: GNUCOBJC
LSDA: 0x403b1c
Phase 2: Fight!
Not the handler frame, looking up the cleanup again
2017-12-11 20:07:47.505 RunTest[10350:10350] Caught ObjC exception
2017-12-11 20:07:47.505 RunTest[10350:10350] Caught Cpp exception
2017-12-11 20:07:47.505 RunTest[10350:10350] Running the finally section
2017-12-11 20:07:47.505 RunTest[10350:10350] Caught Cpp exception