File 3751-EDoc-Allow-user-defined-macros-to-be-functions.patch of Package erlang

From 6343871cf4275a26591ded6f11362b47728ad732 Mon Sep 17 00:00:00 2001
From: Max Nordlund <max.nordlund@kivra.com>
Date: Fri, 26 Jun 2020 14:44:39 +0200
Subject: [PATCH 1/2] EDoc: Allow user defined macros to be functions

This makes them equal to the builtin ones, and allows for neat things
like linking to the offical docs page:

```
man_doc_macro(MacroArg, _Line, _Env) ->
    {ok, Pattern} = re:compile("([^:]+):([^/]+)/(\\d+)"),
    {match, [Module, Function, Arity]} = re:run(
        MacroArg, Pattern, [{capture, all_but_first, binary}]
    ),
    lists:flatten(io_lib:format(
        "<a href=\"https://erlang.org/man/~ts.html#~ts-~ts\"><code>~ts</code></a>",
        [Module, Function, Arity, MacroArg]
    )).
```
---
 lib/edoc/src/edoc_macros.erl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/edoc/src/edoc_macros.erl b/lib/edoc/src/edoc_macros.erl
index d5a11d438b..2aab1a3750 100644
--- a/lib/edoc/src/edoc_macros.erl
+++ b/lib/edoc/src/edoc_macros.erl
@@ -58,6 +58,8 @@ std_macros(Env) ->
 
 check_defs([{K, D} | Ds]) when is_atom(K), is_list(D) ->
     check_defs(Ds);
+check_defs([{K, D} | Ds]) when is_atom(K), is_function(D, 3) ->
+    check_defs(Ds);
 check_defs([X | _Ds]) ->
     report("bad macro definition: ~P.", [X, 10]),
     exit(error);
-- 
2.26.2