* sample/coverage.rb: fix typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36676 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sample/coverage.rb

@@ -17,7 +17,7 @@ at_exit do
         File.writable?(f) || File.writable?(File.dirname(f))
       end
       unless writable[cfile]
-        cfile = cfile.gsub(File.PATH_SEPARATOR, "#")
+        cfile = cfile.gsub(File::PATH_SEPARATOR, "#")
         next unless writable[cfile]
       end