From a9b740b36b4518552d61f349afc02c325413d2ad Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 11 Jun 2018 14:50:03 +0900
Subject: Retrieve `b` operand from the instruction (for debugging); ref #4020

---
 src/vm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/vm.c b/src/vm.c
index 59ae57c32..552bc8072 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1398,6 +1398,7 @@ RETRY_TRY_BLOCK:
     CASE(OP_SEND) {
       /* A B C  R(A) := call(R(A),Syms(B),R(A+1),...,R(A+C)) */
       int a = GETARG_A(i);
+      int b = GETARG_B(i);
       int n = GETARG_C(i);
       int argc = (n == CALL_MAXARGS) ? -1 : n;
       int bidx = (argc < 0) ? a+2 : a+n+1;
@@ -1405,7 +1406,7 @@ RETRY_TRY_BLOCK:
       struct RClass *c;
       mrb_callinfo *ci = mrb->c->ci;
       mrb_value recv, blk;
-      mrb_sym mid = syms[GETARG_B(i)];
+      mrb_sym mid = syms[b];
 
       mrb_assert(bidx < ci->nregs);
 
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