errorformatrb-fail

:cl shows this mess

 2 /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36: in `const
_missing': uninitialized constant Test (NameError)
 3 from /home/rking/src/pegex-rb/test/helper.rb:17: in `<top (required)>'
 4 from /home/rking/src/pegex-rb/test/test_basics.rb:1: in `require'
 5 from /home/rking/src/pegex-rb/test/test_basics.rb:1: in `<top (required)>'
 6 from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:10
: in `require'
 7 from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:10
: in `block (2 levels) in <main>'
 8 from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:9:
 in `each'
 9 from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:9:
 in `block in <main>'
10 from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:4:
 in `select'
11 from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:4:
 in `<main>'
13 Command failed with status :1: [/home/rking/.rbenv/versions/1.9.3-p194/bin...
]

(That is, it jumps me to the very top line, which is not the real source of the problem, and furthermore :cn brings me to a file named "in `<top (required)>'")

errorformat is coming from compiler/ruby.vim, which says:

CompilerSet errorformat=
    \%+E%f:%l:\ parse\ error,
    \%W%f:%l:\ warning:\ %m,
    \%E%f:%l:in\ %*[^:]:\ %m,
    \%E%f:%l:\ %m,
    \%-C%\tfrom\ %f:%l:in\ %.%#,
    \%-Z%\tfrom\ %f:%l,
    \%-Z%p^,
    \%-G%.%#

Actual output looks like:

/home/rking/.rbenv/versions/1.9.3-p194/bin/ruby -I"lib:lib:test" -I"/home/rking/local/gems/gems/rake-0.9.2.2/lib" "/home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb" "test/**/test_*.rb" 
/home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36:in `const_missing': uninitialized constant Test (NameError)
        from /home/rking/src/pegex-rb/test/helper.rb:17:in `<top (required)>'
        from /home/rking/src/pegex-rb/test/test_basics.rb:1:in `require'
        from /home/rking/src/pegex-rb/test/test_basics.rb:1:in `<top (required)>'
        from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:10:in `require'
        from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:10:in `block (2 levels) in <main>'
        from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:9:in `each'
        from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:9:in `block in <main>'
        from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:4:in `select'
        from /home/rking/local/gems/gems/rake-0.9.2.2/lib/rake/rake_test_loader.rb:4:in `<main>'
rake aborted!
Command failed with status (1): [/home/rking/.rbenv/versions/1.9.3-p194/bin...]

Tasks: TOP => default => test
(See full trace by running task with --trace)