[DRE-maint] Bug#888123: ruby-crack: FTBFS on ruby2.5: uninitialized constant SafeYAML::Parse::Date::DateTime

[Chris West (Faux)]

Source: ruby-crack
Version: 0.4.3-2
Severity: important
User: debian-ruby at lists.debian.org
Usertags: ruby2.5

Dear Maintainer,

This package fails to build against ruby2.5. Soon, there will
be a transition to ruby2.5, and this package will FTBFS in sid.

There may be some details on the wiki about common problems:
https://wiki.debian.org/Teams/Ruby/Ruby25Transition

Build log excerpt:

┌──────────────────────────────────────────────────────────────────────────────┐
│ Run tests for ruby2.5 from debian/ruby-tests.rake                            │
└──────────────────────────────────────────────────────────────────────────────┘

RUBYLIB=/build/ruby-crack-0.4.3/debian/ruby-crack/usr/lib/ruby/vendor_ruby:. GEM_PATH=debian/ruby-crack/usr/share/rubygems-integration/all:/root/.gem/ruby/2.5.0:/var/lib/gems/2.5.0:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.5.0:/usr/share/rubygems-integration/2.5.0:/usr/share/rubygems-integration/all ruby2.5 -S rake -f debian/ruby-tests.rake
/usr/bin/ruby2.5 -w -I"lib:test"  "/usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb" "test/hash_test.rb" "test/json_test.rb" "test/parser_test.rb" "test/string_test.rb" "test/xml_test.rb" 
/build/ruby-crack-0.4.3/test/hash_test.rb:10: warning: ambiguous first argument; put parentheses or a space even after `/' operator
/build/ruby-crack-0.4.3/test/hash_test.rb:11: warning: ambiguous first argument; put parentheses or a space even after `/' operator
/build/ruby-crack-0.4.3/test/hash_test.rb:12: warning: ambiguous first argument; put parentheses or a space even after `/' operator
/build/ruby-crack-0.4.3/test/hash_test.rb:22: warning: ambiguous first argument; put parentheses or a space even after `/' operator
/build/ruby-crack-0.4.3/test/hash_test.rb:23: warning: ambiguous first argument; put parentheses or a space even after `/' operator
/build/ruby-crack-0.4.3/test/hash_test.rb:24: warning: ambiguous first argument; put parentheses or a space even after `/' operator
/usr/lib/ruby/vendor_ruby/safe_yaml/parse/date.rb:22:in `<class:Date>': uninitialized constant SafeYAML::Parse::Date::DateTime (NameError)
Did you mean?  SafeYAML::Parse::Date::DATE_MATCHER
	from /usr/lib/ruby/vendor_ruby/safe_yaml/parse/date.rb:3:in `<class:Parse>'
	from /usr/lib/ruby/vendor_ruby/safe_yaml/parse/date.rb:2:in `<module:SafeYAML>'
	from /usr/lib/ruby/vendor_ruby/safe_yaml/parse/date.rb:1:in `<top (required)>'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/vendor_ruby/safe_yaml/load.rb:14:in `<top (required)>'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /build/ruby-crack-0.4.3/lib/crack/json.rb:6:in `<top (required)>'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /build/ruby-crack-0.4.3/lib/crack.rb:6:in `<top (required)>'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /build/ruby-crack-0.4.3/test/test_helper.rb:3:in `<top (required)>'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /build/ruby-crack-0.4.3/test/hash_test.rb:1:in `<top (required)>'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from /usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb:17:in `block in <main>'
	from /usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb:5:in `select'
	from /usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb:5:in `<main>'
rake aborted!
Command failed with status (1): [ruby -w -I"lib:test"  "/usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb" "test/hash_test.rb" "test/json_test.rb" "test/parser_test.rb" "test/string_test.rb" "test/xml_test.rb" ]

Tasks: TOP => default => test
(See full trace by running task with --trace)
ERROR: Test "ruby2.5" failed. Exiting.
dh_auto_install: dh_ruby --install /build/ruby-crack-0.4.3/debian/ruby-crack returned exit code 1
debian/rules:6: recipe for target 'binary' failed
make: *** [binary] Error 1
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2

Full build log:
https://rbuild.fau.xxx/2018-01-23/ruby-crack.log

Please fix it!

Cheers,
Chris.