From c68eda34ef8b0d2df9cd1d133b99b64d32e8c622 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20H=C3=B6gberg?= <john@erlang.org>
Date: Tue, 26 Feb 2019 14:52:38 +0100
Subject: beam_validator: Tolerate the 'receive' hack in prim_eval

---
 erts/preloaded/src/prim_eval.S | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'erts/preloaded')

diff --git a/erts/preloaded/src/prim_eval.S b/erts/preloaded/src/prim_eval.S
index e4b1560517..900fda5d89 100644
--- a/erts/preloaded/src/prim_eval.S
+++ b/erts/preloaded/src/prim_eval.S
@@ -42,6 +42,10 @@
   {label,3}.
     {loop_rec,{f,5},{x,0}}.
     {move,{y,1},{x,1}}.
+    %% Tell the validator that it's safe to pass the message as an argument,
+    %% as the match fun is "known" not to build a term with it, and the
+    %% loop_rec instruction has disabled the GC.
+    {'%', {remove_fragility, {x,0}}}.
     {call_fun,1}.
     {test,is_ne_exact,{f,4},[{x,0},{atom,nomatch}]}.
     remove_message.
-- 
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