Fix incorrect bundled gems warning for hyphenated gem names

When requiring a file like "benchmark/ips", the warning system would
incorrectly warn about the "benchmark" gem not being a default gem,
even when the user has "benchmark-ips" (a separate third-party gem)
in their Gemfile.

The fix checks if a hyphenated version of the require path exists in
the bundle specs before issuing a warning. For example, requiring
"benchmark/ips" now checks for both "benchmark" and "benchmark-ips"
in the Gemfile.

[Bug #21828]

lib/bundled_gems.rb

@@ -124,6 +124,16 @@ module Gem::BUNDLED_GEMS # :nodoc:
 
     return if specs.include?(name)
 
+    # Don't warn if a hyphenated gem provides this feature
+    # (e.g., benchmark-ips provides benchmark/ips, not the benchmark gem)
+    if subfeature
+      feature_parts = feature.split("/")
+      if feature_parts.size >= 2
+        hyphenated_gem = "#{feature_parts[0]}-#{feature_parts[1]}"
+        return if specs.include?(hyphenated_gem)
+      end
+    end
+
     return if WARNED[name]
     WARNED[name] = true
 

test/test_bundled_gems.rb

@@ -32,4 +32,17 @@ class TestBundlerGem < Gem::TestCase
     assert Gem::BUNDLED_GEMS.warning?(path, specs: {})
     assert_nil Gem::BUNDLED_GEMS.warning?(path, specs: {})
   end
+
+  def test_no_warning_for_hyphenated_gem
+    # When benchmark-ips gem is in specs, requiring "benchmark/ips" should not warn
+    # about the benchmark gem (Bug #21828)
+    assert_nil Gem::BUNDLED_GEMS.warning?("benchmark/ips", specs: {"benchmark-ips" => true})
+  end
+
+  def test_warning_without_hyphenated_gem
+    # When benchmark-ips is NOT in specs, requiring "benchmark/ips" should warn
+    warning = Gem::BUNDLED_GEMS.warning?("benchmark/ips", specs: {})
+    assert warning
+    assert_match(/benchmark/, warning)
+  end
 end