JRuby

[19] Incompatible behaviour of splat operator (*) with objects that implement #to_a (w.r.t. MRI)

Details

  • Type: Bug Bug
  • Status: Closed Closed
  • Priority: Minor Minor
  • Resolution: Fixed
  • Affects Version/s: JRuby 1.6
  • Fix Version/s: JRuby 1.6.1
  • Component/s: Ruby 1.9.2
  • Labels:
    None
  • Environment:
    jruby-1.6.0 under OSX 10.6 and ruby-1.9.2p136
  • Number of attachments :
    0

Description

It seems that the behaviour of JRuby's splat operator is to call #to_a on an object to splat it out

$ ruby -v
ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-darwin10.6.0]
$ ruby -e 'class A; def to_a; nil end end; p *A.new'
#<A:0x0000010086dd40>
$ jruby --1.9 -e 'class A; def to_a; nil end end; p *A.new'
TypeError: `to_a' did not return Array
(root) at -e:1

I'm honestly not sure if this is considered a bug in JRuby or MRI, but I'd like to see the behaviour consistent across implementations. It seems related to JRUBY-4584, if that helps.

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Loren Segal added a comment -

Sorry, I guess I didn't really complete my initial sentence there. I should have added:

"This causes a problem with objects that return 'nil' for #to_a. Ruby 1.9.2 seems to be fine with these objects (isn't calling #to_a?), but JRuby throws an exception."

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Loren Segal added a comment - Sorry, I guess I didn't really complete my initial sentence there. I should have added: "This causes a problem with objects that return 'nil' for #to_a. Ruby 1.9.2 seems to be fine with these objects (isn't calling #to_a?), but JRuby throws an exception."
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Thomas E Enebo added a comment -

I changed the description to point out that this is only a 1.9 (with --1.9) issue. Marking as Ruby1.9.2 component. We match MRI 1.8.7 in 1.8 mode.

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Thomas E Enebo added a comment - I changed the description to point out that this is only a 1.9 (with --1.9) issue. Marking as Ruby1.9.2 component. We match MRI 1.8.7 in 1.8 mode.
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Charles Oliver Nutter added a comment -

Thanks for the report!

JRuby:

commit a0bd87b7075ddae1c2c727e907dfeb5ed6822731
Author: Charles Oliver Nutter <headius@headius.com>
Date: Fri Mar 25 22:38:43 2011 -0500

Fix JRUBY-5632: [19] Incompatible behaviour of splat operator with objects that implement #to_a (w.r.t. MRI)

RubySpec:

commit 010cd5f92591db30448f724a92d9d0245a0f4470
Author: Charles Oliver Nutter <headius@headius.com>
Date: Fri Mar 25 22:17:55 2011 -0500

Splat produces the object in array when object's to_a returns nil (JRUBY-5632)

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Charles Oliver Nutter added a comment - Thanks for the report! JRuby: commit a0bd87b7075ddae1c2c727e907dfeb5ed6822731 Author: Charles Oliver Nutter <headius@headius.com> Date: Fri Mar 25 22:38:43 2011 -0500 Fix JRUBY-5632 : [19] Incompatible behaviour of splat operator with objects that implement #to_a (w.r.t. MRI) RubySpec: commit 010cd5f92591db30448f724a92d9d0245a0f4470 Author: Charles Oliver Nutter <headius@headius.com> Date: Fri Mar 25 22:17:55 2011 -0500 Splat produces the object in array when object's to_a returns nil ( JRUBY-5632 )

People

  • Assignee:
    Charles Oliver Nutter
    Reporter:
    Loren Segal
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Dates

  • Created:
    Updated:
    Resolved: