Ruby Raise in a block test

raise-in-a-block.rb

ree-1.8.7-2010.02 :001 > def me
ree-1.8.7-2010.02 :002?>     yield
ree-1.8.7-2010.02 :003?>   end
 => nil 
ree-1.8.7-2010.02 :004 > 
ree-1.8.7-2010.02 :005 >   me do
ree-1.8.7-2010.02 :006 >       begin
ree-1.8.7-2010.02 :007 >           raise "goobers"
ree-1.8.7-2010.02 :008?>       rescue
ree-1.8.7-2010.02 :009?>         p "I caught the goober"
ree-1.8.7-2010.02 :010?>       end
ree-1.8.7-2010.02 :011?>   end
"I caught the goober"
 => nil 
ree-1.8.7-2010.02 :012 > 
ree-1.8.7-2010.02 :013 >   
ree-1.8.7-2010.02 :014 >   me do
ree-1.8.7-2010.02 :015 >       raise "gobblers" rescue p "I cought the gobbler"
ree-1.8.7-2010.02 :016?>   end
"I cought the gobbler"
 => nil 
ree-1.8.7-2010.02 :017 > 


ruby-1.9.2-p180 :001 > def me
ruby-1.9.2-p180 :002?>     yield
ruby-1.9.2-p180 :003?>   end
 => nil 
ruby-1.9.2-p180 :004 > 
ruby-1.9.2-p180 :005 >   me do
ruby-1.9.2-p180 :006 >       begin
ruby-1.9.2-p180 :007 >           raise "goobers"
ruby-1.9.2-p180 :008?>       rescue
ruby-1.9.2-p180 :009?>         p "I caught the goober"
ruby-1.9.2-p180 :010?>       end
ruby-1.9.2-p180 :011?>   end
"I caught the goober"
 => "I caught the goober" 
ruby-1.9.2-p180 :012 > 
ruby-1.9.2-p180 :013 >   
ruby-1.9.2-p180 :014 >   me do
ruby-1.9.2-p180 :015 >       raise "gobblers" rescue p "I cought the gobbler"
ruby-1.9.2-p180 :016?>   end
"I cought the gobbler"
 => "I cought the gobbler" 
ruby-1.9.2-p180 :017 > 

weeeeeird.

ruby-1.9.2-p290 :001 > def me; yield; end
=> nil
ruby-1.9.2-p290 :002 > me { raise "boo!"
ruby-1.9.2-p290 :003?> rescue => e
ruby-1.9.2-p290 :004?> puts e
ruby-1.9.2-p290 :005?> }
SyntaxError: (irb):3: syntax error, unexpected keyword_rescue, expecting '}'
rescue => e
^
from /Users/matt/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in <main>' ruby-1.9.2-p290 :006 > me do raise "boo!" ruby-1.9.2-p290 :007?> rescue => e ruby-1.9.2-p290 :008?> puts e ruby-1.9.2-p290 :009?> end SyntaxError: (irb):7: syntax error, unexpected keyword_rescue, expecting keyword_end rescue => e ^ from /Users/matt/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in

'
ruby-1.9.2-p290 :010 > me do raise "boo!"
ruby-1.9.2-p290 :011?> rescue
ruby-1.9.2-p290 :012?> puts "boo!"
ruby-1.9.2-p290 :013?> end
SyntaxError: (irb):11: syntax error, unexpected keyword_rescue, expecting keyword_end
from /Users/matt/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in `'
ruby-1.9.2-p290 :014 >

what you can't do is an implicit rescue in a block ie: omit the begin unless you are using the modifier form.

ruby-1.9.2-p180 :020 > me do
ruby-1.9.2-p180 :021 > raise "kerfluffle"
ruby-1.9.2-p180 :022?> rescue
ruby-1.9.2-p180 :023?> p "I cought the kerfluffle"
ruby-1.9.2-p180 :024?> end
SyntaxError: (irb):22: syntax error, unexpected keyword_rescue, expecting keyword_end
rescue
^
from /Users/donovan/.rvm/rubies/ruby-1.9.2-p180/bin/irb:16:in `

'

yup. that explains it.

see, did learn something today :)

Cheers man!