require 'weakref'

foo = Object.new
p foo.to_s                    # original's class
foo = WeakRef.new(foo)
p foo.to_s                    # should be same class
ObjectSpace.garbage_collect
ObjectSpace.garbage_collect
p foo.to_s                    # should raise exception (recycled)
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<div class='path'>path: <a href='/ruby.git/log/?id=03fd60937dab442906f00e3d0dbba8d10b1c66a8'>root</a>/<a href='/ruby.git/log/vm_dump.c?id=03fd60937dab442906f00e3d0dbba8d10b1c66a8'>vm_dump.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/ruby.git/log/vm_dump.c?id=03fd60937dab442906f00e3d0dbba8d10b1c66a8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-10-10 21:58:56 +0900'>2021-10-10</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=ef352c58659eaecdcb1e5dc384de7dc1e1205a6c'>Shorten register names on arm64-darwin not to be truncated</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2021-06-10 16:31:29 -0700'>2021-06-10</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=d74e5d5b4fba41a9120b3ed2762cf765478605ad'>Crash more nicely when the VM isn't fully set up</a></td><td>Aaron Patterson</td></tr>
<tr><td><span title='2021-06-07 11:47:16 -0700'>2021-06-07</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=459a9f82c91bddabef0fe1d394c23b0adce96b7c'>Don't create objects during GC</a></td><td>Aaron Patterson</td></tr>
<tr><td><span title='2021-06-02 21:50:40 -0700'>2021-06-02</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=007e439fe965871c73127928f7244ebb96a86e58'>Do not expect ec on rb_vm_bugreport</a></td><td>Takashi Kokubun</td></tr>
<tr><td><span title='2021-05-04 14:56:55 +0200'>2021-05-04</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=9e2483ee0b2cee0f8f8cc0b0fdfbe8abef462c00'>vm_dump.c: rename HAVE_BACKTRACE to USE_BACKTRACE</a></td><td>Benoit Daloze</td></tr>
<tr><td><span title='2021-04-04 23:29:16 +0900'>2021-04-04</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=3cd3d25dde87b5afec30881ec72cedf92216155f'>Unify code by word sizes</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2021-03-22 23:32:07 +0900'>2021-03-22</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=35d30c6ac5a882e2d3b34a9a838f39c2f58531df'>vm dump display return address in the abscence of X30 in Mac ARM64.</a></td><td>David CARLIER</td></tr>
<tr><td><span title='2021-02-10 04:39:41 +0900'>2021-02-10</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=66394aec9813e52751e2b099ee6a4814ace494f8'>vm_dump.c: Dump machine registers on RISC-V Linux</a></td><td>Yusuke Endoh</td></tr>
<tr><td><span title='2021-02-04 17:47:12 +0900'>2021-02-04</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=f71659d47bacdaeb57689de7274413e64937637c'>Revert "vm_dump.c: Do not show C backtrace on riscv"</a></td><td>Yusuke Endoh</td></tr>
<tr><td><span title='2021-01-31 09:53:03 +0900'>2021-01-31</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=3813bb41524a1e2f0b08b6e2f1213ba46477a5f7'>vm_dump: dump registers for Mac M1</a></td><td>David CARLIER</td></tr>
<tr><td><span title='2021-01-13 12:47:42 +0900'>2021-01-13</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=d8fb0bca5475d62731ba871adf344fef88f62bbf'>Removed excess stringizations on regstr [Bug #17532]</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2020-12-16 15:32:11 +0900'>2020-12-16</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=19157a3c001d68acdc8e5190a806189840d23375'>vm debug: dump registers on ARM too. (#3900)</a></td><td>David CARLIER</td></tr>
<tr><td><span title='2020-12-10 21:56:49 -0800'>2020-12-10</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=885135f84cd609fb1c7be3fa0a20ae77969eae9d'>Allow an MJIT worker to show a backtrace on SEGV</a></td><td>Takashi Kokubun</td></tr>
<tr><td><span title='2020-12-02 16:16:48 +0900'>2020-12-02</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=30ded41fc3237f83470d0f6b64103f18bc92a78d'>Loaded script is unset yet when crashed in the initialization phase</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2020-11-18 03:52:41 +0900'>2020-11-18</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=5e3259ea7490a2542d78c433eb8c9d44c7819e61'>fix public interface</a></td><td>Koichi Sasada</td></tr>
<tr><td><span title='2020-09-03 21:11:06 +0900'>2020-09-03</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=79df14c04b452411b9d17e26a398e491bca1a811'>Introduce Ractor mechanism for parallel execution</a></td><td>Koichi Sasada</td></tr>
<tr><td><span title='2020-05-26 16:58:28 +0900'>2020-05-26</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=04eb05a8e0456ee00fa7443803283b78337d6515'>Prefer configured printf format for mingw gcc 10</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2020-05-11 09:24:08 +0900'>2020-05-11</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=9e41a75255d15765648279629fd3134cae076398'>sed -i 's|ruby/impl|ruby/internal|'</a></td><td>卜部昌平</td></tr>
<tr><td><span title='2020-05-11 09:24:08 +0900'>2020-05-11</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=d7f4d732c199df24620a162372c71ee83ed21e62'>sed -i s|ruby/3|ruby/impl|g</a></td><td>卜部昌平</td></tr>
<tr><td><span title='2020-04-20 23:59:05 +0900'>2020-04-20</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=6985bfb72c8d7e7d94f1aad1f0902b602bbfa6da'>vm_dump.c: Do not show C backtrace on riscv</a></td><td>Yusuke Endoh</td></tr>
<tr><td><span title='2020-04-19 23:41:52 +0900'>2020-04-19</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=e92f3e12169e94ba8b230322de938ce540899345'>Removed useless VMDEBUG definition [ci skip]</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2020-04-19 23:38:25 +0900'>2020-04-19</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=73bd2b70e2570279e72404a1aa8bc451ad0f90b5'>Update VMDEBUG reference doc [ci skip]</a></td><td>Nguyễn Quang Minh</td></tr>
<tr><td><span title='2020-04-08 13:28:13 +0900'>2020-04-08</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=9e6e39c3512f7a962c44dc3729c98a0f8be90341'>Merge pull request #2991 from shyouhei/ruby.h</a></td><td>卜部昌平</td></tr>
<tr><td><span title='2020-02-22 09:58:59 +0900'>2020-02-22</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=b9007b6c548f91e88fd3f2ffa23de740431fa969'>Introduce disposable call-cache.</a></td><td>Koichi Sasada</td></tr>
<tr><td><span title='2020-01-06 15:06:03 +0900'>2020-01-06</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=33d866558b4792d877e7735d2239b1337d334c6c'>support RUBY_ON_BUG envval on assert failure.</a></td><td>Koichi Sasada</td></tr>
<tr><td><span title='2019-12-27 00:46:59 +0900'>2019-12-27</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=baf37a5f9c34b660fdb0eb3f899df1303365c723'>Get rid of LIST_HEAD conflict with a system header on macOS</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2019-12-26 20:45:12 +0900'>2019-12-26</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=5e22f873ed26092522f9bfc617d729bac88b284f'>decouple internal.h headers</a></td><td>卜部昌平</td></tr>
<tr><td><span title='2019-12-20 09:32:42 +0900'>2019-12-20</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=db166290088fb7d39d01f68b9860253893d4f1a7'>Fixed misspellings</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2019-12-12 17:03:47 +0900'>2019-12-12</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=54e089df9e37d438687effd092feda2442116c62'>show self on control frame dump.</a></td><td>Koichi Sasada</td></tr>
<tr><td><span title='2019-12-05 14:47:31 +0900'>2019-12-05</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=edb80dfe3e6086fb9d5d905a40cdd6ec61a2e1ee'>add additional CF info for CI env</a></td><td>Koichi Sasada</td></tr>
<tr><td><span title='2019-09-27 10:20:56 +0900'>2019-09-27</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=0c6f36668a11902903d85ada61a812d297d02de5'>Adjusted spaces [ci skip]</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2019-08-19 17:36:28 +0900'>2019-08-19</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=6dd9736c3a73ecd9b0dcf47348a81fb934eb88b3'>crash report on mac little update</a></td><td>David CARLIER</td></tr>
<tr><td><span title='2019-08-09 23:10:06 +0900'>2019-08-09</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=314b50d7c05e946e4e9bbc5fdb38ecb67180c139'>#include &lt;&gt; for system headers</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2019-06-19 23:30:04 +1200'>2019-06-19</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=d17344cfc56edc4599252041b3ec0d46af0851fd'>Remove IA64 support.</a></td><td>Samuel Williams</td></tr>
<tr><td><span title='2019-02-07 08:53:13 +0000'>2019-02-07</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=a67788b2f365d993c879ad0754f41bc64389459c'>Split procstat_vm.c</a></td><td>nobu</td></tr>
<tr><td><span title='2018-11-07 12:48:39 +0000'>2018-11-07</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=fc14c408aa0d75693d2e296e5b4a8e7406004aa2'>* expand tabs. [ci skip]</a></td><td>svn</td></tr>
<tr><td><span title='2018-11-07 12:48:36 +0000'>2018-11-07</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=d99d8cc8683ea50e68e20eaeebc51264b58c97a4'>Add cast to suppress warnings on Solaris [ci skip]</a></td><td>nobu</td></tr>
<tr><td><span title='2018-10-20 06:35:25 +0000'>2018-10-20</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=595056135f2b57fc4c018e561d6ad8d59b06b26b'>Support Mach-O on backtrace with DWARF</a></td><td>naruse</td></tr>
<tr><td><span title='2018-09-22 20:13:08 +0000'>2018-09-22</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=55c7b8541ad7f06ceb52abeb34ec6bd414fdde0a'>Fix for old names of mcontext registers</a></td><td>nobu</td></tr>
<tr><td><span title='2018-07-15 11:42:15 +0000'>2018-07-15</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=a343f6609e5accfd20c5a6c66df63d62d759520e'>vm_core.h, vm_dump.c: fix cast</a></td><td>ktsj</td></tr>
<tr><td><span title='2018-07-15 09:47:12 +0000'>2018-07-15</span></td><td><a href='/ruby.git/commit/vm_dump.c?id=99b6ef932fc32412d4080e58b7a066dac083c086'>vm_dump.c: fix warning about constness</a></td><td>ktsj</td></tr>