https://git.ruby-lang.org/ruby.git/commit/?id=1a935606b5

From 1a935606b5e307375ce9d4215a46da2ca91dc1d6 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Fri, 24 Jul 2020 08:09:50 -0700
Subject: [rubygems/rubygems] Fix Kernel#warn override to handle backtrace
 location with nil path

It's very unlikely to hit this case, but it is possible, as
Thread::Backtrace::Location#path can return nil if the location is
a cfunc with no previous iseq.  See location_path in vm_backtrace.c
in Ruby.

https://github.com/rubygems/rubygems/commit/511935645a

diff --git a/lib/rubygems/core_ext/kernel_warn.rb b/lib/rubygems/core_ext/kernel_warn.rb
index e10a845..e030ef8 100644
--- a/lib/rubygems/core_ext/kernel_warn.rb
+++ b/lib/rubygems/core_ext/kernel_warn.rb
@@ -38,10 +38,11 @@ if RUBY_VERSION >= "2.5" https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_warn.rb#L38
 
           start += 1
 
-          path = loc.path
-          unless path.start_with?(rubygems_path) or path.start_with?('<internal:')
-            # Non-rubygems frames
-            uplevel -= 1
+          if path = loc.path
+            unless path.start_with?(rubygems_path) or path.start_with?('<internal:')
+              # Non-rubygems frames
+              uplevel -= 1
+            end
           end
         end
         uplevel = start
-- 
cgit v0.10.2


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