Deprecate GenFSM

We plan to provide better abstractions around GenServer and GenEvent in upcoming releases but we won't do so for GenFSM. There are other interesting approaches out there, like `plain_fsm`, which are easier to understand and use than OTP's FSM.
elixir-lang · Mar 8, 2014 · 455eb4c · 455eb4c · bagwanpankaj · Mar 10, 2014
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,12 +6,16 @@
 
 * Deprecations
   * [File] `File.stream_to!/3` is deprecated
+  * [GenFSM] `GenFSM` is deprecated
   * [Kernel] `%` for sigils is deprecated in favor of `~`
   * [Kernel] `is_range/1` and `is_regex/1` are deprecated in favor of `Range.range?/1` and `Regex.regex?/1`
   * [Stream] `Stream.after/1` is deprecated
   * [URI] `URI.decode_query/1` is deprecated in favor of `URI.decode_query/2` with explicit dict argument
   * [URI] Passing lists as key or values in `URI.encode_query/1` is deprecated
 
+* Backwards incompatible changes
+  * [Mix] Remove `MIX_GIT_FORCE_HTTPS` as Git itself already provides mechanisms for doing so
+
 # v0.12.4 (2014-02-12)
 
 * Enhancements

diff --git a/lib/elixir/lib/gen_fsm/behaviour.ex b/lib/elixir/lib/gen_fsm/behaviour.ex
@@ -166,6 +166,8 @@ defmodule GenFSM.Behaviour do
   @doc false
   defmacro __using__(_) do
     quote location: :keep do
+      IO.puts :stderr, "warning: GenFSM is deprecated and it will be removed in upcoming releases\n#{Exception.format_stacktrace}"
+
       @behaviour :gen_fsm
 
       @doc false

diff --git a/lib/elixir/test/elixir/gen_fsm/behaviour_test.exs b/lib/elixir/test/elixir/gen_fsm/behaviour_test.exs