[DRE-maint] Bug#952637: ruby-asciidoctor-pdf: FTBFS: Could not find 'concurrent-ruby' (~> 1.0.5) - did find: [concurrent-ruby-1.1.6]

[Pirate Praveen]

Package: ruby-asciidoctor-pdf
Version: 1.5.0~alpha.17.dev-6.1
Severity: serious
Control: tags -1 patch

With recent upload to ruby-concurrent to 1.1.6, ruby-asciidoctor-pdf 
started FTBFS because the dependency declared in gemspec is too strict.

┌──────────────────────────────────────────────────────────────────────────────┐
│ Checking Rubygems dependency resolution on ruby2.5                  
         │
└──────────────────────────────────────────────────────────────────────────────┘

GEM_PATH=/<<PKGBUILDDIR>>/debian/ruby-asciidoctor-pdf/usr/share/rubygems-integration/all:/var/lib/gems/2.5.0:/usr/lib/ruby/gems/2.5.0:/usr/share/rubygems-integration/2.5.0:/usr/share/rubygems-integration/all:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.5.0 
ruby2.5 -e gem\ \"asciidoctor-pdf\"
/usr/lib/ruby/2.5.0/rubygems/dependency.rb:312:in `to_specs': Could not 
find 'concurrent-ruby' (~> 1.0.5) - did find: [concurrent-ruby-1.1.6] 
(Gem::MissingSpecVersionError)

It can be fixed easily with  a patch,

commit 0a0cd710110b8445fc5ea5abeb809c97b40b0518
Author: Pirate Praveen <praveen at debian.org>
Date:   Wed Feb 26 22:58:15 2020 +0530

    Relax dependencies of stable libraries

diff --git a/asciidoctor-pdf.gemspec b/asciidoctor-pdf.gemspec
index b66e4ba..8ec4524 100644
--- a/asciidoctor-pdf.gemspec
+++ b/asciidoctor-pdf.gemspec
@@ -47,9 +47,9 @@ An extension for Asciidoctor that converts AsciiDoc 
documents to PDF using the P
   # prawn-svg >= 0.22.1 requires Ruby >= 2.0.0, so we must cast a 
wider net to support Ruby 1.9.3
   s.add_runtime_dependency 'prawn-svg', '>= 0.28.0'
   s.add_runtime_dependency 'prawn-icon', '>= 1.4.0'
-  s.add_runtime_dependency 'safe_yaml', '~> 1.0.4'
+  s.add_runtime_dependency 'safe_yaml', '~> 1.0', '>= 1.0.4'
   s.add_runtime_dependency 'thread_safe', '~> 0.3.6'
-  s.add_runtime_dependency 'concurrent-ruby', '~> 1.0.5'
+  s.add_runtime_dependency 'concurrent-ruby', '~> 1.0', '>= 1.0.5'
   # For our usage, treetop 1.6.2 is slower than 1.5.3
   s.add_runtime_dependency 'treetop', '>= 1.5.3'
 end

I have also sent a merge request 
<https://salsa.debian.org/keithp/asciidoctor-pdf/-/merge_requests/4>

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