Accept Pathname-like object as rule's prerequisite

Author: gemmaro

lib/rake/task_manager.rb

@@ -309,7 +309,11 @@ def make_sources(task_name, task_pattern, extensions)
             ext.call
           end
         else
-          fail "Don't know how to handle rule dependent: #{ext.inspect}"
+          if (ext = Rake.from_pathname(ext)).is_a?(String)
+            ext
+          else
+            fail "Don't know how to handle rule dependent: #{ext.inspect}"
+          end
         end
       }
       result.flatten

test/test_rake_rules.rb

@@ -80,6 +80,16 @@ def test_rule_prereqs_can_be_created_by_string
     assert_equal [OBJFILE], @runs
   end
 
+  def test_rule_prereqs_can_be_created_by_pathname
+    create_file(SRCFILE)
+    create_file(FOOFILE)
+    rule ".o" => [".c", Pathname(FOOFILE)] do |t|
+      @runs << t.name
+    end
+    Task[OBJFILE].invoke
+    assert_equal [OBJFILE], @runs
+  end
+
   def test_rule_prereqs_can_be_created_by_symbol
     task :nonfile do |t|
       @runs << t.name