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

2 files changed, 22 insertions, 0 deletions

diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index 858d910610..9716464718 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -1392,5 +1392,6 @@ Gem::Specification.load_defaults
 
 require 'rubygems/core_ext/kernel_gem'
 require 'rubygems/core_ext/kernel_require'
+require 'rubygems/core_ext/kernel_warn'
 
 Gem.use_gemdeps
diff --git a/lib/rubygems/core_ext/kernel_warn.rb b/lib/rubygems/core_ext/kernel_warn.rb
new file mode 100755
index 0000000000..a06ccd39af
--- /dev/null
+++ b/lib/rubygems/core_ext/kernel_warn.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+if RUBY_VERSION >= "2.5"
+  module Kernel
+    path = "#{__dir__}/"
+    original_warn = instance_method(:warn)
+    Module.new {define_method(:warn, original_warn)}
+    original_warn = method(:warn)
+
+    module_function define_method(:warn) {|message, uplevel: nil|
+      if uplevel
+        while (loc, = caller_locations(uplevel, 1); loc && loc.path.start_with?(path))
+          uplevel += 1
+        end
+        original_warn.call(message, uplevel: uplevel + 1)
+      else
+        original_warn.call(message)
+      end
+    }
+  end
+end