* load.c (loaded_feature_path): stop returning false negatives for

filenames which are trailing substrings of file extensions.  For
  example, 'b', which a trailing substring of ".rb" should not return
  false. [Bug #11155][ruby-core:69206]

* test/ruby/test_autoload.rb: test for fix

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50515 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_autoload.rb

@@ -55,6 +55,32 @@ p Foo::Bar
     }
   end
 
+  def test_autoload_with_unqualified_file_name # [ruby-core:69206]
+    lp = $LOAD_PATH.dup
+    lf = $LOADED_FEATURES.dup
+
+    Dir.mktmpdir('autoload') { |tmpdir|
+      $LOAD_PATH << tmpdir
+
+      Dir.chdir(tmpdir) do
+        eval <<-END
+          class ::Object
+            module A
+              autoload :C, 'b'
+            end
+          end
+        END
+
+        File.open('b.rb', 'w') {|file| file.puts 'module A; class C; end; end'}
+        assert_kind_of Class, ::A::C
+      end
+    }
+  ensure
+    $LOAD_PATH.replace lp
+    $LOADED_FEATURES.replace lf
+    Object.send(:remove_const, :A) if Object.const_defined?(:A)
+  end
+
   def test_require_explicit
     Tempfile.create(['autoload', '.rb']) {|file|
       file.puts 'class Object; AutoloadTest = 1; end'