https://git.ruby-lang.org/ruby.git/commit/?id=76e2370f13

From 76e2370f132f83c16c9de39a0a9356579f364527 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 4 Aug 2019 22:19:18 +0900
Subject: Fix dangling path name from fstring

* load.c (rb_require_internal): make sure in advance that the path
  to be loaded shares a fstring, to get rid of dangling path name.
  Fixed up 5931857281ce45c1c277aa86d1588119ab00a955.  [Bug #16041]

diff --git a/load.c b/load.c
index 9fad2bd..19b4d71 100644
--- a/load.c
+++ b/load.c
@@ -1015,7 +1015,7 @@ rb_require_internal(VALUE fname, int safe) https://github.com/ruby/ruby/blob/trunk/load.c#L1015
 	RUBY_DTRACE_HOOK(FIND_REQUIRE_RETURN, RSTRING_PTR(fname));
 
 	if (found) {
-	    if (!path || !(ftptr = load_lock(RSTRING_PTR(path)))) {
+	    if (!path || !(path = rb_fstring(path), ftptr = load_lock(RSTRING_PTR(path)))) {
 		result = 0;
 	    }
 	    else if (!*ftptr) {
-- 
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