Prefix Decrement Causes Ambiguous Failure: parser.y:606:in `_reduce_273': RKelly::SyntaxError (RKelly::SyntaxError)

[pherris]

I have code that uses a prefix decrement, e.g.

var counter = 0;
var a = ++counter;
var b = --counter;

Instead I have to do this:
var counter = 0;
counter++;
var a = counter;
counter--;
var b = counter;

or I get this stack:
% grunt jsduck --force
Running "jsduck:main" (jsduck) task
parser.y:606:in _reduce_273': RKelly::SyntaxError (RKelly::SyntaxError) from (eval):4:in_reduce_273'
from (eval):3:in _racc_do_parse_c' from (eval):3:indo_parse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/rkelly-remix-0.0.5/lib/rkelly/parser.rb:43:in parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/js/parser.rb:22:inparse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/parser.rb:44:in parse_js_or_css' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/parser.rb:30:inparse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/batch_parser.rb:25:in block in parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:339:incall'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:339:in call_with_index' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:268:inprocess_incoming_jobs'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:251:in block in worker' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:244:infork'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:244:in worker' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:232:inblock in create_workers'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:231:in each' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:231:increate_workers'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:195:in work_in_processes' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:106:inmap'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/util/parallel.rb:28:in map' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/batch_parser.rb:17:inparse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/app.rb:41:in parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/app.rb:21:inrun'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/bin/jsduck:25:in <top (required)>' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/jsduck:23:inload'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/jsduck:23:in <main>' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/ruby_executable_hooks:15:ineval'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/ruby_executable_hooks:15:in <main>' Warning: parser.y:606:in_reduce_273': RKelly::SyntaxError (RKelly::SyntaxError)
from (eval):4:in _reduce_273' from (eval):3:in_racc_do_parse_c'
from (eval):3:in do_parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/rkelly-remix-0.0.5/lib/rkelly/parser.rb:43:inparse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/js/parser.rb:22:in parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/parser.rb:44:inparse_js_or_css'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/parser.rb:30:in parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/batch_parser.rb:25:inblock in parse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:339:in call' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:339:incall_with_index'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:268:in process_incoming_jobs' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:251:inblock in worker'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:244:in fork' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:244:inworker'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:232:in block in create_workers' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:231:ineach'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:231:in create_workers' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:195:inwork_in_processes'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/parallel-0.7.1/lib/parallel.rb:106:in map' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/util/parallel.rb:28:inmap'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/batch_parser.rb:17:in parse' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/app.rb:41:inparse'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/lib/jsduck/app.rb:21:in run' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/gems/jsduck-5.3.4/bin/jsduck:25:in<top (required)>'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/jsduck:23:in load' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/jsduck:23:in

'
from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/ruby_executable_hooks:15:in eval' from /Users/uname/.rvm/gems/ruby-1.9.3-p545@appsdk/bin/ruby_executable_hooks:15:in' Used --force, continuing.

[nene]

Unable to reproduce.

If the RKelly parser would not support the prefix decrement operator, that would be a sever bug, but you're the first one to ever report that. So it's unlikely that the bug is in the parser.