File 0447-beam_lib-Remove-obsolete-module-from-the-beam-type.patch of Package erlang

From 131ff5fac7da80fe8080425182bf29f673ab301c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 19 Oct 2018 05:52:19 +0200
Subject: [PATCH 2/2] beam_lib: Remove obsolete module() from the beam() type

The type `beam()` in the `beam_lib` module is confusing:

    -type beam() :: module() | file:filename() | binary().

It says that the module name can be used to identify the BEAM module
to be accessed, but passing in the module name only works if the BEAM
file is located in the current working directory because the module
is not searched for in the code path.

The reason that it is allowed to pass in the module name as an atom is
for backward compatibility. A long time ago, atoms instead of strings
were used as filenames. For that reason, `filename` and `file` still
accept atoms as filenames (although the practice is frown
upon). `beam_lib` accepts an atom as the filename for the same reason.

To remove the confusion, remove `module()` from the type and the
mention of it in the documentation. Code that uses an atom as a
filename will still work, but Dialyzer will issue a warning.

https://bugs.erlang.org/browse/ERL-696
---
 lib/stdlib/doc/src/beam_lib.xml | 4 ++--
 lib/stdlib/src/beam_lib.erl     | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/stdlib/doc/src/beam_lib.xml b/lib/stdlib/doc/src/beam_lib.xml
index 26d0724aaf..213170df7f 100644
--- a/lib/stdlib/doc/src/beam_lib.xml
+++ b/lib/stdlib/doc/src/beam_lib.xml
@@ -180,8 +180,8 @@ io:fwrite("~s~n", [erl_prettypr:format(erl_syntax:form_list(AC))]).</code>
       <name name="beam"/>
       <desc>
         <p>Each of the functions described below accept either the
-          module name, the filename, or a binary containing the BEAM
-          module.</p>
+        filename (as a string) or a binary containing the BEAM
+        module.</p>
       </desc>
     </datatype>
     <datatype>
diff --git a/lib/stdlib/src/beam_lib.erl b/lib/stdlib/src/beam_lib.erl
index 01181b1097..3386cfcbe6 100644
--- a/lib/stdlib/src/beam_lib.erl
+++ b/lib/stdlib/src/beam_lib.erl
@@ -53,7 +53,7 @@
 
 %%-------------------------------------------------------------------------
 
--type beam() :: module() | file:filename() | binary().
+-type beam() :: file:filename() | binary().
 -type debug_info() :: {DbgiVersion :: atom(), Backend :: module(), Data :: term()} | 'no_debug_info'.
 
 -type forms()     :: [erl_parse:abstract_form() | erl_parse:form_info()].
-- 
2.16.4