https://git.ruby-lang.org/ruby.git/commit/?id=00bdac18cf

From 00bdac18cffce3fb74aa596c828a09e7d52affcd Mon Sep 17 00:00:00 2001
From: bronzdoc <lsagastume1990@g...>
Date: Tue, 28 Jul 2020 22:15:09 -0600
Subject: [rubygems/rubygems] Warn on duplicate dependency in a specification

https://github.com/rubygems/rubygems/commit/af3e5f7883

diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 5e326e0..d3d6d9c 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -556,6 +556,10 @@ class Gem::Specification < Gem::BasicSpecification https://github.com/ruby/ruby/blob/trunk/lib/rubygems/specification.rb#L556
   #   spec.add_runtime_dependency 'example', '~> 1.1', '>= 1.1.4'
 
   def add_runtime_dependency(gem, *requirements)
+    if requirements.uniq.size != requirements.size
+      warn "WARNING: duplicate dependency #{requirements}"
+    end
+
     add_dependency_with_type(gem, :runtime, requirements)
   end
 
diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index c4da823..cd00f74 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -3051,6 +3051,13 @@ Please report a bug if this causes problems. https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_specification.rb#L3051
     end
   end
 
+  def test_duplicate_runtime_dependency
+    expected = "WARNING: duplicate dependency [\"~> 3.0\", \"~> 3.0\"]\n"
+    assert_output nil, expected do
+      @a1.add_runtime_dependency "b", "~> 3.0", "~> 3.0"
+    end
+  end
+
   def set_orig(cls)
     s_cls = cls.singleton_class
     s_cls.send :alias_method, :orig_unresolved_deps , :unresolved_deps
-- 
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