https://git.ruby-lang.org/ruby.git/commit/?id=8b2e1ca10e

From 8b2e1ca10ecf92ad402decd6b1eab586eded0ddb Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 2 Sep 2019 16:47:12 +0900
Subject: Do not clear backtrace in Exception#exception

[Bug #15558]

diff --git a/error.c b/error.c
index 290ab7a..2089c37 100644
--- a/error.c
+++ b/error.c
@@ -970,11 +970,11 @@ exc_exception(int argc, VALUE *argv, VALUE self) https://github.com/ruby/ruby/blob/trunk/error.c#L970
 {
     VALUE exc;
 
+    argc = rb_check_arity(argc, 0, 1);
     if (argc == 0) return self;
     if (argc == 1 && self == argv[0]) return self;
     exc = rb_obj_clone(self);
-    exc_initialize(argc, argv, exc);
-
+    rb_ivar_set(exc, id_mesg, argv[0]);
     return exc;
 }
 
diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index 55f0d27..9de1b2d 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -518,6 +518,18 @@ end.join https://github.com/ruby/ruby/blob/trunk/test/ruby/test_exception.rb#L518
     end;
   end
 
+  def test_backtrace_by_exception
+    begin
+      line = __LINE__; raise "foo"
+    rescue => e
+    end
+    e2 = e.exception("bar")
+    assert_not_equal(e.message, e2.message)
+    assert_equal(e.backtrace, e2.backtrace)
+    loc = e2.backtrace_locations[0]
+    assert_equal([__FILE__, line], [loc.path, loc.lineno])
+  end
+
   Bug4438 = '[ruby-core:35364]'
 
   def test_rescue_single_argument
-- 
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