https://git.ruby-lang.org/ruby.git/commit/?id=1fea0367d2

From 1fea0367d2a09130af71a8304601b4006e552dee Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sun, 22 Nov 2020 22:09:41 -0800
Subject: Clarify the intention of `false &&`


diff --git a/tool/ruby_vm/views/_mjit_compile_send.erb b/tool/ruby_vm/views/_mjit_compile_send.erb
index 2dff016..01ae593 100644
--- a/tool/ruby_vm/views/_mjit_compile_send.erb
+++ b/tool/ruby_vm/views/_mjit_compile_send.erb
@@ -30,7 +30,8 @@ https://github.com/ruby/ruby/blob/trunk/tool/ruby_vm/views/_mjit_compile_send.erb#L30
             && fastpath_applied_iseq_p(ci, captured_cc, iseq = def_iseq_ptr(vm_cc_cme(captured_cc)->def))
             && !(vm_ci_flag(ci) & VM_CALL_TAILCALL))
     )) {
-        if (false && vm_cc_cme(captured_cc)->def->type == VM_METHOD_TYPE_CFUNC)
+        const bool cfunc_debug = false; // Set true when you want to see inlined cfunc
+        if (cfunc_debug && vm_cc_cme(captured_cc)->def->type == VM_METHOD_TYPE_CFUNC)
             fprintf(stderr, "  * %s\n", rb_id2name(vm_ci_mid(ci)));
 
         int sp_inc = (int)sp_inc_of_sendish(ci);
-- 
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