I get frequent crashes with MacVim Snapshot 70 (Vim 7.4) on Mac OS X 10.7.5 
Intel 64 Bit. It happens when autocompletion is used.

Here's the crash log:

Process:         Vim [44568]
Path:            /Applications/MacVim.app/Contents/MacOS/Vim
Identifier:      Vim
Version:         ??? (???)
Code Type:       X86-64 (Native)
Parent Process:  MacVim [44567]

Date/Time:       2013-09-04 10:27:47.362 +0200
OS Version:      Mac OS X 10.7.5 (11G63b)
Report Version:  9

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000010a6db7c0

VM Regions Near 0x10a6db7c0:
    Stack                  000000010a62a000-000000010a6ac000 [  520K] rw-/rwx 
SM=COW  thread 4
--> 
    MALLOC_LARGE           000000010a6e0000-000000010a7e1000 [ 1028K] rw-/rwx 
SM=PRV  

Application Specific Information:
objc[44568]: garbage collection is OFF

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib          0x00007fff873c082a __kill + 10
1   Vim                             0x0000000105968019 mch_exit + 217
2   Vim                             0x000000010596afbe deathtrap + 430
3   libsystem_c.dylib               0x00007fff8482ecfa _sigtramp + 26
4   Vim                             0x0000000105989220 addstate + 656
5   Vim                             0x0000000105989dc8 addstate_here + 40
6   Vim                             0x0000000105987c88 nfa_regmatch + 2824
7   Vim                             0x0000000105986e9e nfa_regtry + 318
8   Vim                             0x000000010598681e nfa_regexec_nl + 110
9   Vim                             0x00000001058a5c77 do_string_sub + 183
10  Vim                             0x00000001058b10e7 f_substitute + 183
11  Vim                             0x000000010589bef3 call_func + 2659
12  Vim                             0x000000010589e462 get_func_tv + 290
13  Vim                             0x00000001058b8abd eval7 + 2525
14  Vim                             0x00000001058b7ead eval6 + 45
15  Vim                             0x00000001058b7b02 eval5 + 66
16  Vim                             0x00000001058b72b7 eval4 + 55
17  Vim                             0x00000001058b7137 eval3 + 39
18  Vim                             0x000000010589ab86 eval1 + 38
19  Vim                             0x000000010589a871 eval0 + 49
20  Vim                             0x000000010589cadb ex_let + 251
21  Vim                             0x00000001058ce845 do_one_cmd + 10821
22  Vim                             0x00000001058cb1bf do_cmdline + 2927
23  Vim                             0x000000010589c163 call_func + 3283
24  Vim                             0x000000010589e462 get_func_tv + 290
25  Vim                             0x00000001058b8abd eval7 + 2525
26  Vim                             0x00000001058b7ead eval6 + 45
27  Vim                             0x00000001058b7b02 eval5 + 66
28  Vim                             0x00000001058b72b7 eval4 + 55
29  Vim                             0x00000001058b7137 eval3 + 39
30  Vim                             0x000000010589ab86 eval1 + 38
31  Vim                             0x000000010589a871 eval0 + 49
32  Vim                             0x000000010589cadb ex_let + 251
33  Vim                             0x00000001058ce845 do_one_cmd + 10821
34  Vim                             0x00000001058cb1bf do_cmdline + 2927
35  Vim                             0x000000010589c163 call_func + 3283
36  Vim                             0x000000010589e462 get_func_tv + 290
37  Vim                             0x00000001058b8abd eval7 + 2525
38  Vim                             0x00000001058b7ead eval6 + 45
39  Vim                             0x00000001058b7b02 eval5 + 66
40  Vim                             0x00000001058b72b7 eval4 + 55
41  Vim                             0x00000001058b7137 eval3 + 39
42  Vim                             0x000000010589ab86 eval1 + 38
43  Vim                             0x000000010589a871 eval0 + 49
44  Vim                             0x000000010589cadb ex_let + 251
45  Vim                             0x00000001058ce845 do_one_cmd + 10821
46  Vim                             0x00000001058cb1bf do_cmdline + 2927
47  Vim                             0x000000010589c163 call_func + 3283
48  Vim                             0x000000010589e462 get_func_tv + 290
49  Vim                             0x00000001058b8abd eval7 + 2525
50  Vim                             0x00000001058b7ead eval6 + 45
51  Vim                             0x00000001058b7b02 eval5 + 66
52  Vim                             0x00000001058b72b7 eval4 + 55
53  Vim                             0x00000001058b7137 eval3 + 39
54  Vim                             0x000000010589ab86 eval1 + 38
55  Vim                             0x000000010589a871 eval0 + 49
56  Vim                             0x000000010589b2a5 eval_expr + 53
57  Vim                             0x0000000105a14359 VimEval + 105
58  org.python.python               0x0000000105cc4d77 PyEval_EvalFrameEx + 
13861
59  org.python.python               0x0000000105cc7df7 0x105c3d000 + 568823
60  org.python.python               0x0000000105cc4e0a PyEval_EvalFrameEx + 
14008
61  org.python.python               0x0000000105cc7df7 0x105c3d000 + 568823
62  org.python.python               0x0000000105cc4e0a PyEval_EvalFrameEx + 
14008
63  org.python.python               0x0000000105cc7df7 0x105c3d000 + 568823
64  org.python.python               0x0000000105cc4e0a PyEval_EvalFrameEx + 
14008
65  org.python.python               0x0000000105cc7cd8 PyEval_EvalCodeEx + 1996
66  org.python.python               0x0000000105cc7d4d PyEval_EvalCode + 54
67  org.python.python               0x0000000105cdf08f 0x105c3d000 + 663695
68  org.python.python               0x0000000105cdf21b PyRun_StringFlags + 105
69  Vim                             0x0000000105a12a4b run_cmd + 27
70  Vim                             0x0000000105a1299e DoPyCommand + 4270
71  Vim                             0x0000000105a118dc ex_python + 60
72  Vim                             0x00000001058ce845 do_one_cmd + 10821
73  Vim                             0x00000001058cb1bf do_cmdline + 2927
74  Vim                             0x000000010589c163 call_func + 3283
75  Vim                             0x000000010589e462 get_func_tv + 290
76  Vim                             0x00000001058b8abd eval7 + 2525
77  Vim                             0x00000001058b7ead eval6 + 45
78  Vim                             0x00000001058b7b02 eval5 + 66
79  Vim                             0x00000001058b72b7 eval4 + 55
80  Vim                             0x00000001058b7137 eval3 + 39
81  Vim                             0x000000010589ab86 eval1 + 38
82  Vim                             0x000000010589a871 eval0 + 49
83  Vim                             0x00000001058a46a0 ex_return + 96
84  Vim                             0x00000001058ce845 do_one_cmd + 10821
85  Vim                             0x00000001058cb1bf do_cmdline + 2927
86  Vim                             0x000000010589c163 call_func + 3283
87  Vim                             0x000000010589b441 call_vim_function + 369
88  Vim                             0x000000010589826c expand_by_function + 140
89  Vim                             0x0000000105896d2d ins_compl_get_exp + 1117
90  Vim                             0x0000000105893f45 ins_compl_next + 741
91  Vim                             0x00000001058912cb ins_complete + 3243
92  Vim                             0x000000010588c74a edit + 14138
93  Vim                             0x0000000105948fb5 nv_edit + 1029
94  Vim                             0x000000010594204c normal_cmd + 5708
95  Vim                             0x0000000105a26f2d main_loop + 1421
96  Vim                             0x0000000105a262e3 main + 13139
97  Vim                             0x0000000105877d94 start + 52

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