https://git.ruby-lang.org/ruby.git/commit/?id=7661150109

From 766115010932d977142097f60c76dd20af73196e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Fri, 8 Nov 2019 11:11:21 +0900
Subject: revival of __func__

dad2abc69fdd1af52df353b8604017bd6a5c6a99 deleted __func__ but ruby
already use this feature under RUBY_FUNCTION_NAME_STRING macro.
Use it.

diff --git a/compile.c b/compile.c
index 08a7576..b9106d2 100644
--- a/compile.c
+++ b/compile.c
@@ -9769,9 +9769,9 @@ ibf_load_builtin(const struct ibf_load *load, ibf_offset_t *offset) https://github.com/ruby/ruby/blob/trunk/compile.c#L9769
     }
 
     const struct rb_builtin_function *table = GET_VM()->builtin_function_table;
-    if (table == NULL) rb_bug("ibf_load_builtin: table is not provided.");
+    if (table == NULL) rb_bug("%s: table is not provided.", RUBY_FUNCTION_NAME_STRING);
     if (strncmp(table[i].name, name, len) != 0) {
-        rb_bug("ibf_load_builtin: index (%d) mismatch (expect %s but %s).", i, name, table[i].name);
+        rb_bug("%s: index (%d) mismatch (expect %s but %s).", RUBY_FUNCTION_NAME_STRING, i, name, table[i].name);
     }
     // fprintf(stderr, "load-builtin: name:%s(%d)\n", table[i].name, table[i].argc);
 
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