respect current frame of `rb_eval_string`

`self` is nearest Ruby method's `self`.
If there is no ruby frame, use toplevel `self` (`main`).

https://bugs.ruby-lang.org/issues/18780

1 files changed, 12 insertions, 0 deletions

diff --git a/test/-ext-/eval/test_eval.rb b/test/-ext-/eval/test_eval.rb
new file mode 100644
index 0000000000..27952996e2
--- /dev/null
+++ b/test/-ext-/eval/test_eval.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: false
+require 'test/unit'
+require "-test-/eval"
+
+class  EvalTest < Test::Unit::TestCase
+  def test_rb_eval_string
+    a = 1
+    assert_equal [self, 1, __method__], rb_eval_string(%q{
+      [self, a, __method__]
+    })
+  end
+end