From: David Unric <dunric29a@...>
Date: 2010-11-10T07:56:05+09:00
Subject: Re: Analyzer for errors in code ?

Ryan Davis> Yep, I really understand it's impossible to do static 
(lexical) code analysis in case of a programming language with dynamic 
type system and selfmodifying abilities at the runtime you can 100% rely 
on.
I would just appreciate some helper tool to warn me about _possible_ 
dumb typing errors I will make at writing my code and I would decide if 
it's false or positive warning. Most of time I'm fixing typos rather 
then a mistake in an algorithm. Better then nothing.

Unfortunately none of above mentioned or linked tools detected the use 
of unassigned variable. For an illustration what does pylint for the 
equivalent code in python:

_____ snip ________________________________________
import sys

if __name__ == "__main__":
    my_msg = 'Hello'
    if sys.argv[-1] == 'doit':
        print mymsg
    else:
        print 'Nope'

~$ pylint -E test.py
No config file found, using default configuration
************* Module test
E:  6: Undefined variable 'mymsg'
_____ snip ________________________________________

I'm using the new generation of Ruby, version 1.9.2 concretely. It 
produduces bytecode for YARV interpreter. I'm sure catching an 
intermediate output between parsed source and bytecode would allow 
static analysis I'm calling for. Is this possible with current versions 
Ruby ?

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