[DRE-maint] Bug#794268: FTBFS: "Mercenary::Option compares itself with other options well" fails

[Chris West (Faux)]

Source: ruby-mercenary
Version: 0.3.4-1
Severity: serious
Tags: sid stretch
Justification: fails to build from source
User: reproducible-builds at lists.alioth.debian.org
Usertags: ftbfs

Dear Maintainer,

The package fails to build:

Failures:

  1) Mercenary::Option compares itself with other options well
     Failure/Error: expect(option.eql?(new_option)).to be_true
       expected true to respond to `true?` or perhaps you meant `be true` or `be_truthy`
     # ./spec/option_spec.rb:31:in `block (2 levels) in <top (required)>'

Full build log:
https://reproducible.debian.net/rb-pkg/unstable/amd64/ruby-mercenary.html

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.19.0-23-generic (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)