Getting stack trace info for a ruby warning

Question

I've been running into some strange errors with UTF strings in ruby 1.9. Often ruby will complain on something like this:

warning: regexp match /.../n against to UTF-8 string

I'd like to be able to show a full stack trace on a warning, or apply some kind of monkey patch that i can override the default warning functionality. How would i do this?

Shouldn't the file and line number be displayed in your warning by default? — Andrew Grimm, Sep 26 '11 at 23:05

score 1 · Answer 1 · answered Dec 06 '21 at 04:35

If the warning comes from Ruby code(instead of native C), you can overwrite Warning#warn, then the warning becomes an exception you will get the backtrace of course:

module Warning
  def warn(msg)
    raise msg
  end
end

Thanks to: Can you ask ruby to treat warnings as errors?

score 0 · Answer 2 · answered Sep 26 '11 at 22:57

0

Try $DEBUG = true. That will cause at least some warnings to turn into errors.

answered Sep 26 '11 at 22:57

Daniel Brockman

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In ruby? Can you elaborate? I'm curious how I'd do that. – Thilo Sep 26 '11 at 23:39
@Thilo How you’d set it? Either `ruby --debug` or just `$DEBUG = true`. – Daniel Brockman Sep 26 '11 at 23:43
1

Unfortunately that won't work. I'm already in debugging mode. I'd like to do something like a begin/rescue/end for warnings where i can grab a 'warning' object and get a backtrace from it – Sean McCullough Oct 13 '11 at 18:29

Getting stack trace info for a ruby warning

2 Answers2