File 2463-Implement-timeout-Name-timeouts.patch of Package erlang

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File 2463-Implement-timeout-Name-timeouts.patch of Package erlang (Revision aa120d3233f613ad478314c3181372c5)

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From 30cae2492d8d8e927d57c0dc656ee2dfbec0a70c Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Mon, 13 Feb 2017 08:20:16 +0100
Subject: [PATCH 3/4] Implement {timeout,Name} timeouts

---
 lib/stdlib/doc/src/gen_statem.xml       | 100 ++++++++++++++++++++-------
 lib/stdlib/src/gen_statem.erl           |  79 +++++++++++++---------
 lib/stdlib/test/gen_statem_SUITE.erl    |  70 ++++++++++++++++++-
 system/doc/design_principles/statem.xml | 115 ++++++++++++++++++++++++++------
 4 files changed, 285 insertions(+), 79 deletions(-)

diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml
index 44ac1ad8a..1b99b65e0 100644
--- a/lib/stdlib/doc/src/gen_statem.xml
+++ b/lib/stdlib/doc/src/gen_statem.xml
@@ -67,13 +67,16 @@
 It has the same features and adds some really useful:
 
 <list type="bulleted">
- <item>State code is gathered.</item>
- <item>The state can be any term.</item>
- <item>Events can be postponed.</item>
- <item>Events can be self-generated.</item>
- <item>Automatic state enter code can be called.</item>
- <item>A reply can be sent from a later state.</item>
- <item>There can be multiple <c>sys</c> traceable replies.</item>
+ <item>Gathered state code.</item>
+ <item>Arbitrary term state.</item>
+ <item>Event postponing.</item>
+ <item>Self-generated events.</item>
+ <item>State time-out.</item>
+ <item>Multiple generic named time-outs.</item>
+ <item>Absolute time-out time.</item>
+ <item>Automatic state enter calls.</item>
+ <item>Reply from other state than the request.</item>
+ <item>Multiple <c>sys</c> traceable replies.</item>
 </list>
 
 The callback model(s) for <c>gen_statem</c> differs from
@@ -531,10 +534,12 @@ handle_event(_, _, State, Data) ->
 	 originate from the corresponding API functions.
 	 For calls, the event contains whom to reply to.
 	 Type <c>info</c> originates from regular process messages sent
-	 to the <c>gen_statem</c>. Also, the state machine
-	 implementation can generate events of types
-	 <c>timeout</c>, <c>state_timeout</c>,
-	 and <c>internal</c> to itself.
+	 to the <c>gen_statem</c>. The state machine
+	 implementation can, in addition to the above,
+	 generate
+	 <seealso marker="#type-event_type"><c>events of types</c></seealso>
+	 <c>timeout</c>, <c>{timeout,<anno>Name</anno>}</c>,
+	 <c>state_timeout</c>, and <c>internal</c> to itself.
 	
 </desc>
 </datatype>
@@ -701,13 +706,14 @@ handle_event(_, _, State, Data) ->
 	 </item>
 	 <item>
 	 
-	 Timeout timers 
- <seealso marker="#type-state_timeout"><c>state_timeout()</c></seealso>
+	 Time-out timers 
+ <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso>,
+ <seealso marker="#type-generic_timeout"><c>generic_timeout()</c></seealso>
 	 and 
- <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso>
+ <seealso marker="#type-state_timeout"><c>state_timeout()</c></seealso>
 	 are handled. Time-outs with zero time are guaranteed to be
 	 delivered to the state machine before any external
-	 not yet received event so if there is such a timeout requested,
+	 not yet received event so if there is such a time-out requested,
 	 the corresponding time-out zero event is enqueued as
 	 the newest event.
 	 
@@ -795,8 +801,8 @@ handle_event(_, _, State, Data) ->
 	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
 	 for how <c>Time</c> and
 	 <seealso marker="#type-timeout_option"><c>Options</c></seealso>
-	 are interpreted. All <c>Options</c> of <c>erlang:start_timer/4</c>
-	 will not necessarily be supported in the future.
+	 are interpreted. Future <c>erlang:start_timer/4</c> <c>Options</c>
+	 will not necessarily be supported.
 	
 	
 	 Any event that arrives cancels this time-out.
@@ -822,6 +828,42 @@ handle_event(_, _, State, Data) ->
 </desc>
 </datatype>
 <datatype>
+ <name name="generic_timeout"/>
+ <desc>
+	
+	 Starts a timer set by
+	 <seealso marker="#type-enter_action"><c>enter_action()</c></seealso>
+	 <c>{timeout,Name}</c>.
+	 When the timer expires an event of
+	 <seealso marker="#type-event_type"><c>event_type()</c></seealso>
+	 <c>{timeout,Name}</c> will be generated.
+	 See
+	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
+	 for how <c>Time</c> and
+	 <seealso marker="#type-timeout_option"><c>Options</c></seealso>
+	 are interpreted. Future <c>erlang:start_timer/4</c> <c>Options</c>
+	 will not necessarily be supported.
+	
+	
+	 If <c>Time</c> is <c>infinity</c>,
+	 no timer is started, as it never would expire anyway.
+	
+	
+	 If <c>Time</c> is relative and <c>0</c>
+	 no timer is actually started,
+	 instead the the time-out event is enqueued to ensure
+	 that it gets processed before any not yet
+	 received external event.
+	
+	
+	 Setting a timer with the same <c>Name</c> while it is running
+	 will restart it with the new time-out value.
+	 Therefore it is possible to cancel
+	 a specific time-out by setting it to <c>infinity</c>.
+	
+ </desc>
+ </datatype>
+ <datatype>
 <name name="state_timeout"/>
 <desc>
 	
@@ -835,8 +877,8 @@ handle_event(_, _, State, Data) ->
 	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
 	 for how <c>Time</c> and
 	 <seealso marker="#type-timeout_option"><c>Options</c></seealso>
-	 are interpreted. All <c>Options</c> of <c>erlang:start_timer/4</c>
-	 will not necessarily be supported in the future.
+	 are interpreted. Future <c>erlang:start_timer/4</c> <c>Options</c>
+	 will not necessarily be supported.
 	
 	
 	 If <c>Time</c> is <c>infinity</c>,
@@ -861,7 +903,7 @@ handle_event(_, _, State, Data) ->
 <desc>
 	
 	 If <c>Abs</c> is <c>true</c> an absolute timer is started,
-	 and if it <c>false</c> a relative, which is the default.
+	 and if it is <c>false</c> a relative, which is the default.
 	 See
 	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
 	 for details.
@@ -986,7 +1028,19 @@ handle_event(_, _, State, Data) ->
 	 <seealso marker="#type-transition_option"><c>transition_option()</c></seealso>
 	 <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso>
 	 to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>
-	 and options
+	 and time-out options
+	 <seealso marker="#type-timeout_option"><c><anno>Options</anno></c></seealso>.
+	 
+	 </item>
+	 <tag><c>{timeout,<anno>Name</anno>}</c></tag>
+	 <item>
+	 
+	 Sets the
+	 <seealso marker="#type-transition_option"><c>transition_option()</c></seealso>
+	 <seealso marker="#type-generic_timeout"><c>generic_timeout()</c></seealso>
+	 to <c><anno>Time</anno></c> for <c><anno>Name</anno></c>
+	 with <c><anno>EventContent</anno></c>
+	 and time-out options
 	 <seealso marker="#type-timeout_option"><c><anno>Options</anno></c></seealso>.
 	 
 	 </item>
@@ -997,7 +1051,7 @@ handle_event(_, _, State, Data) ->
 	 <seealso marker="#type-transition_option"><c>transition_option()</c></seealso>
 	 <seealso marker="#type-state_timeout"><c>state_timeout()</c></seealso>
 	 to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>
-	 and options
+	 and time-out options
 	 <seealso marker="#type-timeout_option"><c><anno>Options</anno></c></seealso>.
 	 
 	 </item>
@@ -1270,7 +1324,7 @@ handle_event(_, _, State, Data) ->
 	 to avoid that the calling process dies when the call
 	 times out, you will have to be prepared to handle
 	 a late reply.
-	 So why not just allow the calling process to die?
+	 So why not just let the calling process die?
 	 
 	</note>
 	
diff --git a/lib/stdlib/src/gen_statem.erl b/lib/stdlib/src/gen_statem.erl
index fe80bb5de..6f566b8be 100644
--- a/lib/stdlib/src/gen_statem.erl
+++ b/lib/stdlib/src/gen_statem.erl
@@ -78,8 +78,9 @@
 -type data() :: term().
 
 -type event_type() ::
-	{'call',From :: from()} | 'cast' |
-	'info' | 'timeout' | 'state_timeout' | 'internal'.
+	{'call',From :: from()} | 'cast' | 'info' |
+	'timeout' | {'timeout', Name :: term()} | 'state_timeout' |
+	'internal'.
 
 -type callback_mode_result() ::
 	callback_mode() | [callback_mode() | state_enter()].
@@ -88,7 +89,7 @@
 
 -type transition_option() ::
 	postpone() | hibernate() |
-	event_timeout() | state_timeout().
+	event_timeout() | generic_timeout() | state_timeout().
 -type postpone() ::
 	%% If 'true' postpone the current event
 	%% and retry it when the state changes (=/=)
@@ -100,6 +101,9 @@
 	%% Generate a ('timeout', EventContent, ...) event
 	%% unless some other event is delivered
 	Time :: timeout() | integer().
+-type generic_timeout() ::
+	%% Generate a ({'timeout',Name}, EventContent, ...) event
+	Time :: timeout() | integer().
 -type state_timeout() ::
 	%% Generate a ('state_timeout', EventContent, ...) event
 	%% unless the state is changed
@@ -142,6 +146,14 @@
 	 Time :: event_timeout(),
 	 EventContent :: term(),
 	 Options :: (timeout_option() | [timeout_option()])} |
+	%%
+	{{'timeout', Name :: term()}, % Set the generic_timeout option
+	 Time :: generic_timeout(), EventContent :: term()} |
+	{{'timeout', Name :: term()}, % Set the generic_timeout option
+	 Time :: generic_timeout(),
+	 EventContent :: term(),
+	 Options :: (timeout_option() | [timeout_option()])} |
+	%%
 	{'state_timeout', % Set the state_timeout option
 	 Time :: state_timeout(), EventContent :: term()} |
 	{'state_timeout', % Set the state_timeout option
@@ -311,37 +323,26 @@
 %% Type validation functions
 callback_mode(CallbackMode) ->
 case CallbackMode of
-	state_functions ->
-	 true;
-	handle_event_function ->
-	 true;
-	_ ->
-	 false
+	state_functions -> true;
+	handle_event_function -> true;
+	_ -> false
 end.
 %%
-from({Pid,_}) when is_pid(Pid) ->
- true;
-from(_) ->
- false.
+from({Pid,_}) when is_pid(Pid) -> true;
+from(_) -> false.
 %%
 event_type({call,From}) ->
 from(From);
 event_type(Type) ->
 case Type of
-	{call,From} ->
-	 from(From);
-	cast ->
-	 true;
-	info ->
-	 true;
-	timeout ->
-	 true;
-	state_timeout ->
-	 true;
-	internal ->
-	 true;
-	_ ->
-	 false
+	{call,From} -> from(From);
+	cast -> true;
+	info -> true;
+	timeout -> true;
+	state_timeout -> true;
+	internal -> true;
+	{timeout,_} -> true;
+	_ -> false
 end.
 
 
@@ -1387,15 +1388,27 @@ parse_actions(
 		 ?STACKTRACE()}
 	 end;
 	%%
-	{TimerType,_,_} = Timeout
-	 when TimerType =:= timeout;
-	 TimerType =:= state_timeout ->
+	{{timeout,_},_,_} = Timeout ->
+	 parse_actions_timeout(
+	 Debug, S, State, Actions,
+	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
+	{{timeout,_},_,_,_} = Timeout ->
+	 parse_actions_timeout(
+	 Debug, S, State, Actions,
+	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
+	{timeout,_,_} = Timeout ->
+	 parse_actions_timeout(
+	 Debug, S, State, Actions,
+	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
+	{timeout,_,_,_} = Timeout ->
+	 parse_actions_timeout(
+	 Debug, S, State, Actions,
+	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
+	{state_timeout,_,_} = Timeout ->
 	 parse_actions_timeout(
 	 Debug, S, State, Actions,
 	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
-	{TimerType,_,_,_} = Timeout
-	 when TimerType =:= timeout;
-	 TimerType =:= state_timeout ->
+	{state_timeout,_,_,_} = Timeout ->
 	 parse_actions_timeout(
 	 Debug, S, State, Actions,
 	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
diff --git a/lib/stdlib/test/gen_statem_SUITE.erl b/lib/stdlib/test/gen_statem_SUITE.erl
index ee6109915..36b1f761a 100644
--- a/lib/stdlib/test/gen_statem_SUITE.erl
+++ b/lib/stdlib/test/gen_statem_SUITE.erl
@@ -38,7 +38,7 @@ all() ->
 {group, abnormal},
 {group, abnormal_handle_event},
 shutdown, stop_and_reply, state_enter, event_order,
- state_timeout, event_types, code_change,
+ state_timeout, event_types, generic_timers, code_change,
 {group, sys},
 hibernate, enter_loop].
 
@@ -834,6 +834,7 @@ event_types(_Config) ->
 			{next_event,timeout,3},
 			{next_event,info,4},
 			{next_event,cast,5},
+			{next_event,{timeout,6}, 6},
 			{next_event,Call,Req}]}
 	 end,
 	 state1 =>
@@ -857,6 +858,10 @@ event_types(_Config) ->
 		 {next_state, state6, undefined}
 	 end,
 	 state6 =>
+	 fun ({timeout,6}, 6, undefined) ->
+		 {next_state, state7, undefined}
+	 end,
+	 state7 =>
 	 fun ({call,From}, stop, undefined) ->
 		 {stop_and_reply, shutdown,
 		 [{reply,From,stopped}]}
@@ -884,6 +889,69 @@ event_types(_Config) ->
 
 
 
+generic_timers(_Config) ->
+ process_flag(trap_exit, true),
+
+ Machine =
+	%% Abusing the internal format of From...
+	#{init =>
+	 fun () ->
+		 {ok, start, undefined}
+	 end,
+	 start =>
+	 fun ({call,_} = Call, Req, undefined) ->
+		 {next_state, state1, undefined,
+		 [{{timeout,a},1500,1},
+			{state_timeout,1500,1},
+			{{timeout,b},1000,1},
+			{next_event,Call,Req}]}
+	 end,
+	 state1 =>
+	 fun ({call,_} = Call, Req, undefined) ->
+		 T = erlang:monotonic_time(millisecond) + 500,
+		 {next_state, state2, undefined,
+		 [{{timeout,c},T,2,{abs,true}},
+			{{timeout,d},0,2,[{abs,false}]},
+			{timeout,0,2},
+			{{timeout,b},infinity,2},
+			{{timeout,a},1000,{Call,Req}}]}
+	 end,
+	 state2 =>
+	 fun ({timeout,d}, 2, undefined) ->
+		 {next_state, state3, undefined}
+	 end,
+	 state3 =>
+	 fun ({timeout,c}, 2, undefined) ->
+		 {next_state, state4, undefined}
+	 end,
+	 state4 =>
+	 fun ({timeout,a}, {{call,From},stop}, undefined) ->
+		 {stop_and_reply, shutdown,
+		 [{reply,From,stopped}]}
+	 end},
+ {ok,STM} =
+	gen_statem:start_link(
+	 ?MODULE, {map_statem,Machine,[]}, [{debug,[trace]}]),
+
+ stopped = gen_statem:call(STM, stop),
+ receive
+	{'EXIT',STM,shutdown} ->
+	 ok
+ after 500 ->
+	 ct:fail(did_not_stop)
+ end,
+
+ {noproc,_} =
+	?EXPECT_FAILURE(gen_statem:call(STM, hej), Reason),
+ case flush() of
+	[] ->
+	 ok;
+	Other2 ->
+	 ct:fail({unexpected,Other2})
+ end.
+
+
+
 sys1(Config) ->
 {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []),
 {status, Pid, {module,gen_statem}, _} = sys:get_status(Pid),
diff --git a/system/doc/design_principles/statem.xml b/system/doc/design_principles/statem.xml
index f4d84ab16..f01615fdc 100644
--- a/system/doc/design_principles/statem.xml
+++ b/system/doc/design_principles/statem.xml
@@ -4,7 +4,7 @@
 <chapter>
 <header>
 <copyright>
- <year>2016</year><year>2017</year>
+ <year>2016-2017</year>
 <holder>Ericsson AB. All Rights Reserved.</holder>
 </copyright>
 <legalnotice>
@@ -293,6 +293,13 @@ StateName(EventType, EventContent, Data) ->
 	<seealso marker="#State Time-Outs">State Time-Outs</seealso>
 </item>
 <item>
+	Start a
+	<seealso marker="stdlib:gen_statem#type-generic_timeout">
+	 generic time-out</seealso>,
+	 read more in section
+	<seealso marker="#Generic Time-Outs">Generic Time-Outs</seealso>
+ </item>
+ <item>
 	Start an
 	<seealso marker="stdlib:gen_statem#type-event_timeout">event time-out</seealso>,
 	see more in section
@@ -320,8 +327,9 @@ StateName(EventType, EventContent, Data) ->
 	<c>gen_statem(3)</c>
 </seealso>
 manual page.
- You can, for example, reply to many callers
- and generate multiple next events to handle.
+ You can, for example, reply to many callers,
+ generate multiple next events,
+ and set time-outs to relative or absolute times.
 
 </section>
 
@@ -369,6 +377,14 @@ StateName(EventType, EventContent, Data) ->
 	</seealso>
 	state timer timing out.
 </item>
+ <tag><c>{timeout,Name}</c></tag>
+ <item>
+	Generated by state transition action
+	<seealso marker="stdlib:gen_statem#type-generic_timeout">
+	 <c>{{timeout,Name},Time,EventContent}</c>
+	</seealso>
+	generic timer timing out.
+ </item>
 <tag><c>timeout</c></tag>
 <item>
 	Generated by state transition action
@@ -450,7 +466,7 @@ locked(
 [Digit] ->
 	 do_unlock(),
 {next_state, open, Data#{remaining := Code},
- [{state_timeout,10000,lock}];
+ [{state_timeout,10000,lock}]};
 [Digit|Rest] -> % Incomplete
 {next_state, locked, Data#{remaining := Rest}};
 _Wrong ->
@@ -779,7 +795,7 @@ handle_event(cast, {button,Digit}, State, #{code := Code} = Data) ->
 		[Digit] -> % Complete
 		 do_unlock(),
 		 {next_state, open, Data#{remaining := Code},
- [{state_timeout,10000,lock}};
+ [{state_timeout,10000,lock}]};
 		[Digit|Rest] -> % Incomplete
 		 {keep_state, Data#{remaining := Rest}};
 		[_|_] -> % Wrong
@@ -873,7 +889,7 @@ stop() ->
 <marker id="Event Time-Outs" />
 <title>Event Time-Outs</title>
 
- A timeout feature inherited from <c>gen_statem</c>'s predecessor
+ A time-out feature inherited from <c>gen_statem</c>'s predecessor
 <seealso marker="stdlib:gen_fsm"><c>gen_fsm</c></seealso>,
 is an event time-out, that is,
 if an event arrives the timer is cancelled.
@@ -906,24 +922,24 @@ locked(
 ...
 ]]></code>
 
- Whenever we receive a button event we start an event timeout
+ Whenever we receive a button event we start an event time-out
 of 30 seconds, and if we get an event type <c>timeout</c>
 we reset the remaining code sequence.
 
 
- An event timeout is cancelled by any other event so you either
- get some other event or the timeout event. It is therefore
- not possible nor needed to cancel or restart an event timeout.
+ An event time-out is cancelled by any other event so you either
+ get some other event or the time-out event. It is therefore
+ not possible nor needed to cancel or restart an event time-out.
 Whatever event you act on has already cancelled
- the event timeout...
+ the event time-out...
 
 </section>
 
 
 
 <section>
- <marker id="Erlang Timers" />
- <title>Erlang Timers</title>
+ <marker id="Generic Time-Outs" />
+ <title>Generic Time-Outs</title>
 
 The previous example of state time-outs only work if
 the state machine stays in the same state during the
@@ -934,13 +950,68 @@ locked(
 You may want to start a timer in one state and respond
 to the time-out in another, maybe cancel the time-out
 without changing states, or perhaps run multiple
- time-outs in parallel. All this can be accomplished
- with Erlang Timers:
+ time-outs in parallel. All this can be accomplished with
+ <seealso marker="stdlib:gen_statem#type-generic_timeout">generic time-outs</seealso>.
+ They may look a little bit like
+ <seealso marker="stdlib:gen_statem#type-event_timeout">event time-outs</seealso>
+ but contain a name to allow for any number of them simultaneously
+ and they are not automatically cancelled.
+ 
+ 
+ Here is how to accomplish the state time-out
+ in the previous example by instead using a generic time-out
+ named <c>open_tm</c>:
+ 
+ <code type="erl"><![CDATA[
+...
+locked(
+ cast, {button,Digit},
+ #{code := Code, remaining := Remaining} = Data) ->
+ case Remaining of
+ [Digit] ->
+	 do_unlock(),
+ {next_state, open, Data#{remaining := Code},
+	 [{{timeout,open_tm},10000,lock}]};
+...
+
+open({timeout,open_tm}, lock, Data) ->
+ do_lock(),
+ {next_state,locked,Data};
+open(cast, {button,_}, Data) ->
+ {keep_state,Data};
+...
+ ]]></code>
+ 
+ Just as
+ <seealso marker="#State Time-Outs">state time-outs</seealso>
+ you can restart or cancel a specific generic time-out
+ by setting it to a new time or <c>infinity</c>.
+ 
+ 
+ Another way to handle a late time-out can be to not cancel it,
+ but to ignore it if it arrives in a state
+ where it is known to be late.
+ 
+ </section>
+
+
+
+ <section>
+ <marker id="Erlang Timers" />
+ <title>Erlang Timers</title>
+ 
+ The most versatile way to handle time-outs is to use
+ Erlang Timers; see
 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer3,4</c></seealso>.
+ Most time-out tasks can be performed with the
+ time-out features in <c>gen_statem</c>,
+ but an example of one that can not is if you should need
+ the return value from
+ <seealso marker="erts:erlang#cancel_timer/2"><c>erlang:cancel_timer(Tref)</c></seealso>, that is; the remaining time of the timer.
 
 
 Here is how to accomplish the state time-out
- in the previous example by insted using an Erlang Timer:
+ in the previous example by instead using an Erlang Timer:
 
 <code type="erl"><![CDATA[
 ...
@@ -1596,7 +1667,7 @@ handle_event(
 {call,From}, code_length,
 {_StateName,_LockButton}, #{code := Code}) ->
 {keep_state_and_data,
- [{reply,From,length(Code)}]};
+ [{reply,From,length(Code)}]};
 %%
 %% State: locked
 handle_event(
@@ -1636,7 +1707,7 @@ handle_event(
 	 if
 		Digit =:= LockButton ->
 		 {next_state, {locked,LockButton}, Data,
-		 [{reply,From,locked}]);
+		 [{reply,From,locked}]};
 		true ->
 		 {keep_state_and_data,
 		 [postpone]}
@@ -1710,10 +1781,10 @@ handle_event(
 EventType, EventContent,
 {open,LockButton}, Data) ->
 case {EventType, EventContent} of
-	{enter, _OldState} ->
-	 do_unlock(),
-	 {keep_state_and_data,
-	 [{state_timeout,10000,lock},hibernate]};
+ {enter, _OldState} ->
+ do_unlock(),
+ {keep_state_and_data,
+ [{state_timeout,10000,lock},hibernate]};
 ...
 ]]></code>
 
-- 
2.12.2

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File 2463-Implement-timeout-Name-timeouts.patch of Package erlang (Revision aa120d3233f613ad478314c3181372c5)

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