Issue #7837 has been reported by enebo (Thomas Enebo).

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Bug #7837: IO.open with three arguments where third argument is bogus reports an arity problem instead of type problem
https://bugs.ruby-lang.org/issues/7837

Author: enebo (Thomas Enebo)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.0.0dev (2013-02-08 trunk 39161) [x86_64-darwin11.4.2]


I am reporting this against 2.0.rc2 but it also applies to mri 1.9.3.  If I run the following one-liner:

mri20 -e 'f = File.open("tmp"); IO.open(f.fileno, "r", :heh)'

I get the error:

-e:1:in `initialize': wrong number of arguments (3 for 1..2) (ArgumentError)

This seems wrong because if I change the third argument to an options hash it works fine.  So having an arity of 3 is not a problem for open.  It is that :heh is not a hash.  I think this should generate a TypeError.




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