Merge pull request #2946 from gogainda/truffleruby

Add TruffleRuby support

Author: JonRowe

lib/rspec/core/formatters/exception_presenter.rb

@@ -242,6 +242,10 @@ def find_failed_line
           line_regex = RSpec.configuration.in_project_source_dir_regex
           loaded_spec_files = RSpec.configuration.loaded_spec_files
 
+          exception_backtrace.reject! do |line|
+            line.start_with?("<internal:")
+          end
+
           exception_backtrace.find do |line|
             next unless (line_path = line[/(.+?):(\d+)(|:\d+)/, 1])
             path = File.expand_path(line_path)

spec/rspec/core_spec.rb

@@ -13,6 +13,9 @@
   # JRuby appears to not respect `--disable=gem` so rubygems also gets loaded.
   allowed_loaded_features << /rubygems/ if RSpec::Support::Ruby.jruby?
 
+  # Truffleruby cext files
+  allowed_loaded_features << /\/truffle\/cext/ if RSpec::Support::Ruby.truffleruby?
+
   disable_autorun_code =
     if RSpec::Support::OS.windows?
       # On Windows, the "redefine autorun" approach results in a different