gistfile1.txt

$ gem generate_index --backtrace
Loading 26 gems from .
..........................
Loaded all gems
ERROR:  While executing gem ... (ArgumentError)
    unnumbered mixed with numbered
	kernel/common/sprintf.rb:373:in `get_arg'
	kernel/common/sprintf.rb:141:in `format'
	kernel/common/sprintf.rb:121:in `parse'
	kernel/common/string.rb:52:in `%'
	lib/rubygems.rb:935:in `time'
	lib/rubygems/indexer.rb:415:in `collect_specs'
	lib/rubygems/indexer.rb:535:in `generate_index'
	lib/rubygems/commands/generate_index_command.rb:127:in `execute'
	lib/rubygems/command.rb:257:in `invoke'
	lib/rubygems/command_manager.rb:132:in `process_args'
	lib/rubygems/command_manager.rb:102:in `run'
	lib/rubygems/gem_runner.rb:58:in `run'
	lib/bin/gem.rb:21:in `__script__'
	kernel/common/compiled_method.rb:242:in `as_script'
	kernel/delta/requirer.rb:267:in `single_load'
	kernel/delta/requirer.rb:98:in `unified_load'
	kernel/common/kernel.rb:675:in `load'
	kernel/loader.rb:420:in `script'
	kernel/loader.rb:521:in `main'
	kernel/loader.rb:526:in `__script__'