[ruby/rubygems] Preserve overrides when SpecSet self-derives a validation set

SpecSet#incomplete_specs_for_platform constructed a fresh
self.class.new(@specs) for platform validation but never copied
@overrides. Platform-validity decisions therefore evaluated strict
required_ruby_version / required_rubygems_version metadata even when
resolution was running with overrides, so a metadata override could
allow a gem everywhere except platform validation, where the platform
might be marked incomplete and pruned.

Carry @overrides forward via with_overrides on the cloned SpecSet.

https://github.com/ruby/rubygems/commit/11b7c58a5a

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2 files changed, 27 insertions, 1 deletions

diff --git a/lib/bundler/spec_set.rb b/lib/bundler/spec_set.rb
index 84f20d90d0..163e16863b 100644
--- a/lib/bundler/spec_set.rb
+++ b/lib/bundler/spec_set.rb
@@ -155,7 +155,7 @@ module Bundler
     def incomplete_specs_for_platform(deps, platform)
       return [] if @specs.empty?
 
-      validation_set = self.class.new(@specs)
+      validation_set = self.class.new(@specs).with_overrides(@overrides)
       validation_set.for(deps, [platform])
       validation_set.incomplete_specs
     end
diff --git a/spec/bundler/bundler/spec_set_spec.rb b/spec/bundler/bundler/spec_set_spec.rb
index d69d0bf8fd..dce86793b9 100644
--- a/spec/bundler/bundler/spec_set_spec.rb
+++ b/spec/bundler/bundler/spec_set_spec.rb
@@ -92,4 +92,30 @@ RSpec.describe Bundler::SpecSet do
       ]
     end
   end
+
+  describe "#with_overrides" do
+    it "defaults to an empty override list" do
+      expect(described_class.new([]).overrides).to eq([])
+    end
+
+    it "stores the overrides supplied" do
+      override = Bundler::Override.new("rails", :version, ">= 8.0")
+      expect(described_class.new([]).with_overrides([override]).overrides).to eq([override])
+    end
+
+    it "treats nil as an empty override list" do
+      set = described_class.new([])
+      override = Bundler::Override.new("rails", :version, ">= 8.0")
+      set.with_overrides([override])
+      set.with_overrides(nil)
+      expect(set.overrides).to eq([])
+    end
+
+    it "cascades overrides to contained specs that accept them" do
+      lazy = Bundler::LazySpecification.new("rails", "8.0", Gem::Platform::RUBY)
+      override = Bundler::Override.new("rails", :version, ">= 8.0")
+      described_class.new([lazy]).with_overrides([override])
+      expect(lazy.overrides).to eq([override])
+    end
+  end
 end