From f0b815dc670b61eba1daaa67a8613ac431d32b16 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 28 Nov 2019 12:18:17 +0900
Subject: `Proc` made by `Symbol#to_proc` should be a lambda [Bug #16260]

---
 proc.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'proc.c')

diff --git a/proc.c b/proc.c
index 83ec61d0f5..e0cba7109b 100644
--- a/proc.c
+++ b/proc.c
@@ -697,6 +697,7 @@ sym_proc_new(VALUE klass, VALUE sym)
     GetProcPtr(procval, proc);
 
     vm_block_type_set(&proc->block, block_type_symbol);
+    proc->is_lambda = TRUE;
     RB_OBJ_WRITE(procval, &proc->block.as.symbol, sym);
     return procval;
 }
-- 
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