kernel_warn.rb: skip kernel_require.rb

* lib/rubygems/core_ext/kernel_warn.rb (Kernel#warn): skip
  kernel_require.rb's frames when `uplevel` option is given.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/rubygems/test_require.rb b/test/rubygems/test_require.rb
index ed856c7648..65e1505bd2 100644
--- a/test/rubygems/test_require.rb
+++ b/test/rubygems/test_require.rb
@@ -412,6 +412,24 @@ class TestGemRequire < Gem::TestCase
     end
   end
 
+  if RUBY_VERSION >= "2.5"
+    def test_no_kernel_require_in_warn_with_uplevel
+      lib = File.realpath("../../../lib", __FILE__)
+      Dir.mktmpdir("warn_test") do |dir|
+        File.write(dir + "/sub.rb", "warn 'uplevel test', uplevel: 2\n")
+        File.write(dir + "/main.rb", "require 'sub'\n")
+        _, err = capture_subprocess_io do
+          system(@@ruby, "-w", "--disable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
+        end
+        assert_equal "main.rb:1: warning: uplevel test\n", err
+        _, err = capture_subprocess_io do
+          system(@@ruby, "-w", "--enable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
+        end
+        assert_equal "main.rb:1: warning: uplevel test\n", err
+      end
+    end
+  end
+
   def silence_warnings
     old_verbose, $VERBOSE = $VERBOSE, false
     yield