File 4981-beam_call_types-Improve-types-of-maps-from... of Package erlang

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File 4981-beam_call_types-Improve-types-of-maps-from_list-1-et.patch of Package erlang (Revision 048167bcaa30c6163f4d1505a6baf337)

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From 5e2d2196e082b5c2dc21a9b16f5be69bd0a5ffbd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20H=C3=B6gberg?= <john@erlang.org>
Date: Mon, 7 Feb 2022 15:38:30 +0100
Subject: [PATCH] beam_call_types: Improve types of maps:from_list/1 et al

---
 lib/compiler/src/beam_call_types.erl | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/lib/compiler/src/beam_call_types.erl b/lib/compiler/src/beam_call_types.erl
index f7764c295f..10f98eac1f 100644
--- a/lib/compiler/src/beam_call_types.erl
+++ b/lib/compiler/src/beam_call_types.erl
@@ -604,8 +604,11 @@ types(maps, fold, [Fun, Init, _Map]) ->
               end,
     sub_unsafe(RetType, [#t_fun{arity=3}, any, #t_map{}]);
 types(maps, from_keys, [Keys, Value]) ->
-    RetType = #t_map{super_key=erlang_hd_type(Keys),
-                     super_value=Value},
+    KeyType = erlang_hd_type(Keys),
+    RetType = case KeyType of
+                  none -> #t_map{super_key=none,super_value=none};
+                  _ -> #t_map{super_key=KeyType,super_value=Value}
+              end,
     sub_unsafe(RetType, [proper_list(), any]);
 types(maps, from_list, [Pairs]) ->
     PairType = erlang_hd_type(Pairs),
-- 
2.34.1

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File 4981-beam_call_types-Improve-types-of-maps-from_list-1-et.patch of Package erlang (Revision 048167bcaa30c6163f4d1505a6baf337)

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