From: "Stephan Kämper" <Stephan.Kaemper@...>
Date: 2004-09-10T19:20:03+09:00
Subject: Switching off warnings temporarily

Hi,

although always running code with '-w' is a good idea, you sometimes 
might like to switch off warnings locally, temporarily or both.

Now, http://www.caliban.org/ruby/rubyguide.shtml#warnings shows how to 
accomplish this (I just used 'yield' instead of 'call'ing a passed block).

(I know that assigning the result of puts to whatever *is* useless, its 
just to produce a warning)

---- Code starts here ----
def silently
   warn_level = $VERBOSE
   $VERBOSE = false
   res = yield
   $VERBOSE = warn_level
   res
end

bark = puts ( "Here be Dragons!" )

keep_silent = silently do
   any_line_of_code_will_do = 1
   puts ( "Creatures under a smooth surface" )
   nil
end

bark = puts ( "Here be dragons!" )

---- End of the Code ----

Remark: That really reads great: 'silently do ....' :-)
(We might like to see just the opposite 'verbosely do' with warnings 
switch on, no matter what.)

Now I came up with four ways to run this code: With or with out the '-w' 
command line option and with or without the (apparently useless) line 
commented out.

My expectation was ('is' actually) to get two warnings each way.
However

Code run with |  No. of warnings
--------------------------------
#any...   -w  |    3
  any...   -w  |    3
#any...       |    3
  any...       |    2

To get the result I expect, I apparently need to run the code without 
the '-w' option and put some (useless) code before the line that might 
create a warning.

I have to admit that I just don't get it...
Why is that? Do you have any explanations?

Happy rubying

Stephan


-- 
Stephan K�mper/IT-Beratung   http://www.stephankaemper.de
Quality Assurance   /   Software Test   /   Data Analysis