File 5621-Fix-compiler-crash-for-literal-map-generat... of Package erlang

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File 5621-Fix-compiler-crash-for-literal-map-generator-pattern.patch of Package erlang (Revision 7ca8474baff281f894ff6ebde8ccfe01)

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From 58cab53aa9c369cda8f1089676c35ed57bda1538 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 6 Feb 2023 13:12:10 +0100
Subject: [PATCH] Fix compiler crash for literal map generator patterns

---
 lib/compiler/src/v3_core.erl   | 10 ++++++----
 lib/compiler/test/mc_SUITE.erl |  9 +++++++++
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/lib/compiler/src/v3_core.erl b/lib/compiler/src/v3_core.erl
index cedb162eef..8e0ba6ae26 100644
--- a/lib/compiler/src/v3_core.erl
+++ b/lib/compiler/src/v3_core.erl
@@ -87,7 +87,7 @@
 -import(ordsets, [add_element/2,del_element/2,is_element/2,
 		  union/1,union/2,intersection/2,subtract/2]).
 -import(cerl, [ann_c_cons/3,ann_c_tuple/2,c_tuple/1,
-	       ann_c_map/3]).
+	       ann_c_map/3,cons_hd/1,cons_tl/1]).
 
 -include("core_parse.hrl").
 
@@ -1932,10 +1932,12 @@ generator(Line, {m_generate,Lg,{map_field_exact,_,K0,V0},E}, Gs, St0) ->
     {Cg,St3} = lc_guard_tests(Gs, St2),
     {Ce,Pre0,St4} = safe(E, St3),
     AccPat = case Pat of
-                 #c_cons{hd=K,tl=V} ->
-                     #c_tuple{es=[K,V,IterVar]};
                  nomatch ->
-                     nomatch
+                     nomatch;
+                 _ ->
+                     K = cons_hd(Pat),
+                     V = cons_tl(Pat),
+                     #c_tuple{es=[K,V,IterVar]}
              end,
     SkipPat = #c_tuple{es=[SkipK,SkipV,IterVar]},
 
diff --git a/lib/compiler/test/mc_SUITE.erl b/lib/compiler/test/mc_SUITE.erl
index 21aa2c017e..9da2b44479 100644
--- a/lib/compiler/test/mc_SUITE.erl
+++ b/lib/compiler/test/mc_SUITE.erl
@@ -97,6 +97,15 @@ basic(_Config) ->
     [1] = [H || {_,_} := [H|_] <- Map],
     [c, {b,42}] = lists:sort([K || K := [_|_] <- Map]),
 
+    %% Filtering using literal patterns.
+    [] = [0 || a := b <- #{}],
+    [] = [0 || a := b <- #{x => y}],
+    [0] = [0 || a := b <- #{a => b}],
+
+    <<>> = << <<0>> || a := b <- #{} >>,
+    <<>> = << <<0>> || a := b <- #{x => y} >>,
+    <<0>> = << <<0>> || a := b <- #{a => b} >>,
+
     ok.
 
 mc_double(Size) ->
-- 
2.35.3

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File 5621-Fix-compiler-crash-for-literal-map-generator-pattern.patch of Package erlang (Revision 7ca8474baff281f894ff6ebde8ccfe01)

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