report the failing format_char for unimplemented String#% formats
report the failing format_char for unimplemented String#% formats

topazproject/topaz,topazproject/topaz,babelsberg/babelsberg-r,babelsberg/babelsberg-r,topazproject/topaz,babelsberg/babelsberg-r,babelsberg/babelsberg-r,babelsberg/babelsberg-r,topazproject/topaz