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I was running this code in shell and expected it to take default `self()` meta tracer,
and start tracing `erlang:put/2`.
```
F = fun F() -> timer:sleep(5000), erlang:get(unique_field), erlang:put(unique_field, 123), F() end.
erlang:trace_pattern({erlang, put, 2}, [{['$1', '_'], [{'==', '$1', unique_field}], []}], [global]).
erlang:trace_pattern({erlang, get, 1}, [{['_'], [], [{trace, [], [call, timestamp]}]}], [meta]).
Pid = spawn(F).
```
But tracing didn't start:
```
6> flush().
Shell got {trace_ts,<0.70.0>,call,
{erlang,get,[unique_field]},
{1521,118606,753838}}
Shell got {trace_ts,<0.70.0>,call,
{erlang,get,[unique_field]},
{1521,118611,754798}}
Shell got {trace_ts,<0.70.0>,call,
{erlang,get,[unique_field]},
{1521,118616,755705}}
ok
7> erlang:trace_info(Pid, flags).
{flags,[]}
```
Turns out that I had false expectations, that `{trace, _, _}` would enable tracing on that process, inheriting meta tracer process as consumer of trace messages.
Instead it tried to take tracer from executing process (which is pointed out in docs). But there was none, so no tracing was started and flags were simply ignored (which is not that obvious from docs).
Updated docs to point out that there are cases when flags would be simply ignored, and no tracing would start.
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inets: fix scheme validation in http_uri:parse when binary URI
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Conflicts:
OTP_VERSION
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* ingela/ssl/no-sslv2-hello-support/OTP-14824:
ssl: Remove interoperability option v2_hello_compatible
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Remove low memory need for HiPE on x86_64
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* sverker/send-tick/OTP-14681:
kernel: Fix and improve send_tick logic
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* rickard/dirty-work-gone/OTP-14978:
Reschedule on ordinary scheduler if dirty work is gone
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* rickard/pre-alloc-alignment/OTP-14977:
Force 64-bit alignment for pre-allocators unless x86
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* rickard/remove-approx-started/OTP-14975:
Remove process start time for crash dumps
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* sverker/dict-put-immed-opt:
erts: Optimize erlang:put/2 for hash collision lists
erts: Optimize erlang:put/2 for immed values
erts: Refactor erlang:put/2
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* hasse/dialyzer/extra-range/OTP-14970:
ssl: Correct some specs
os_mon: Correct a spec
Fix broken spec in beam_asm
Dialyzer should not throw away spec information because of overspec
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Allow multiple modifier characters in io:format control sequences
OTP-14971
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This makes it possible to print unicode atoms at the same time as
suppressing detection of printable lists.
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* hans/ssh/acceptor_restart/OTP-14955:
ssh: Retry and exponentially backoff listener restart
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* hans/crypto/remove_unused_functions/OTP-14956:
crypto: Remove undocumented, unused and erroneous functions
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* john/erts/tuple-arityval-fixes/OTP-14963/ERL-577:
Make doc entry for maximum tuple size reflect reality
Assert that sz <= MAX_ARITYVAL in make_arityval(sz)
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* john/erts/assert-on-memcpy-memset-etc:
Always use sys_memcpy/cmp/etc instead of plain memcpy/cmp/etc
Check the arguments to sys_memcpy and friends
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* peterdmv/use_uri_string/OTP-14902:
common_test: Use uri_string
ssl: Use uri_string
public_key: Use uri_string
observer: Use uri_string
Change-Id: I4beac2289db039cc7d566807727c5aaf7fadf942
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Make io_lib:unscan_format/1 work with pad char and default precision
OTP-14958
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* hasse/stdlib/improve_limit_term:
stdlib: Improve io_lib:limit_term/2
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Do not treat binaries as top level in dbg_ieval
OTP-14957
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crypto:dh_generate_parameters and crypto:dh_check
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Passing NULL is undefined behavior and unconditionally executing these
may result in the compiler optimizing away a later NULL check. It can
often work since the pointer isn't touched when the length is 0, but
it's a major footgun. See ERL-573.
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Improve handling of maps. Addendum to b57e890.
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Improve documentation of io:format ~p when Unicode is involved
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Change-Id: If9b7c1252642d31e6b802e8410883bfa26292674
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Change-Id: I1249b93b1e4a971cf1af2cb96a65563e23117e2b
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The interoperability option to fallback to insecure renegotiation
now has to be explicitly turned on.
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