https://git.ruby-lang.org/ruby.git/commit/?id=5931857281

From 5931857281ce45c1c277aa86d1588119ab00a955 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 3 Aug 2019 13:41:55 +0900
Subject: Fix dangling path name from fstring

* parse.y (yycompile): make sure in advance that the `__FILE__`
  object shares a fstring, to get rid of dangling path name.
  Fixed up 53e9908d8afc7f03109b0aafd1698ab35f512b05.  [Bug #16041]

* vm_eval.c (eval_make_iseq): ditto.

diff --git a/parse.y b/parse.y
index 3bff42a..de2a922 100644
--- a/parse.y
+++ b/parse.y
@@ -5812,7 +5812,7 @@ yycompile(VALUE vparser, struct parser_params *p, VALUE fname, int line) https://github.com/ruby/ruby/blob/trunk/parse.y#L5812
 	p->ruby_sourcefile = "(none)";
     }
     else {
-	p->ruby_sourcefile_string = rb_str_new_frozen(fname);
+	p->ruby_sourcefile_string = rb_fstring(fname);
 	p->ruby_sourcefile = StringValueCStr(fname);
     }
     p->ruby_sourceline = line - 1;
@@ -9773,7 +9773,7 @@ gettable(struct parser_params *p, ID id, const YYLTYPE *loc) https://github.com/ruby/ruby/blob/trunk/parse.y#L9773
 	    if (NIL_P(file))
 		file = rb_str_new(0, 0);
 	    else
-		file = rb_str_dup(rb_fstring(file));
+		file = rb_str_dup(file);
 	    node = NEW_STR(add_mark_object(p, file), loc);
 	}
 	return node;
diff --git a/test/ruby/test_eval.rb b/test/ruby/test_eval.rb
index 49bb330..3d6116e 100644
--- a/test/ruby/test_eval.rb
+++ b/test/ruby/test_eval.rb
@@ -498,6 +498,17 @@ class TestEval < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_eval.rb#L498
     }, '[Bug #10368]'
   end
 
+  def test_gced_eval_location
+    Dir.mktmpdir do |d|
+      File.write("#{d}/2.rb", "")
+      File.write("#{d}/1.rb", "require_relative '2'\n""__FILE__\n")
+      file = "1.rb"
+      path = File.expand_path(file, d)
+      assert_equal(path, eval(File.read(path), nil, File.expand_path(file, d)))
+      assert_equal(path, eval(File.read(path), nil, File.expand_path(file, d)))
+    end
+  end
+
   def orphan_proc
     proc {eval("return :ng")}
   end
diff --git a/vm_eval.c b/vm_eval.c
index 9281ebd..2cb04af 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1284,6 +1284,7 @@ eval_make_iseq(VALUE src, VALUE fname, int line, const rb_binding_t *bind, https://github.com/ruby/ruby/blob/trunk/vm_eval.c#L1284
     }
 
     if (fname != Qundef) {
+        if (!NIL_P(fname)) fname = rb_fstring(fname);
 	realpath = fname;
     }
     else if (bind) {
@@ -1293,7 +1294,7 @@ eval_make_iseq(VALUE src, VALUE fname, int line, const rb_binding_t *bind, https://github.com/ruby/ruby/blob/trunk/vm_eval.c#L1294
 	rb_parser_warn_location(parser, TRUE);
     }
     else {
-	fname = rb_usascii_str_new_cstr("(eval)");
+	fname = rb_fstring_lit("(eval)");
     }
 
     rb_parser_set_context(parser, base_block, FALSE);
-- 
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