File 2371-Handle-special-cases-of-filter-fun-returns... of Package erlang

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File 2371-Handle-special-cases-of-filter-fun-returns.patch of Package erlang

From 2e1660959c5a08888569ac468ca335a6d6ae2da9 Mon Sep 17 00:00:00 2001
From: Maria-12648430 <maria-12648430@gmx.net>
Date: Mon, 26 Oct 2020 09:13:59 +0100
Subject: [PATCH 1/3] Handle special cases of filter fun returns

If the filter function returns a single-item list
or an empty list, it is treated the same way as
the respective semantically equivalents of true
and false.
---
 lib/stdlib/src/queue.erl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/stdlib/src/queue.erl b/lib/stdlib/src/queue.erl
index 9fe3782f92..69ecfed94b 100644
--- a/lib/stdlib/src/queue.erl
+++ b/lib/stdlib/src/queue.erl
@@ -373,8 +373,12 @@ filter_f(Fun, [X|F]) ->
     case Fun(X) of
 	true ->
 	    [X|filter_f(Fun, F)];
+	[Y] ->
+	    [Y|filter_f(Fun, F)];
 	false ->
 	    filter_f(Fun, F);
+	[] ->
+	    filter_f(Fun, F);
 	L when is_list(L) ->
 	    L++filter_f(Fun, F)
     end.
@@ -388,8 +392,12 @@ filter_r(Fun, [X|R0]) ->
     case Fun(X) of
 	true ->
 	    [X|R];
+	[Y] ->
+	    [Y|R];
 	false ->
 	    R;
+	[] ->
+	    R;
 	L when is_list(L) ->
 	    lists:reverse(L, R)
     end.
-- 
2.26.2

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File 2371-Handle-special-cases-of-filter-fun-returns.patch of Package erlang

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