Warning error in YAML

ruby-talk
1

test_yaml.rb:

require 'yaml’
puts( true.to_yaml )

% ruby test_yaml.rb

prints:

/usr/local/lib/ruby/1.8/yaml/types.rb:49: warning: toplevel constant Hash
referenced by Kernel::Hash
– true

Is this behaviour common? Or I did something wrong. Thanks.

2

but it does not give me any warning on the Windows XP.

Thanks in advance

PS: I just copy /usr/local/lib/ruby/1.8/yaml directory to
c:\ruby\1.8.0\lib\yaml

“Useko Netsumi” REMOVE_THISusenets@nyc.rr.com wrote in message
news:bd8tjr$qp04v$1@ID-159205.news.dfncis.de…

···

test_yaml.rb:

require ‘yaml’
puts( true.to_yaml )

% ruby test_yaml.rb

prints:

/usr/local/lib/ruby/1.8/yaml/types.rb:49: warning: toplevel constant Hash
referenced by Kernel::Hash
– true

Is this behaviour common? Or I did something wrong. Thanks.

3

Is this behaviour common? Or I did something wrong.

No, the problem is in yaml which make reference to Kernel::Hash rather
than Object::Hash

Guy Decoux

4

If that’s true, then how come it did not give any error on windows?

Thanks in advance.

“ts” decoux@moulon.inra.fr wrote in message
news:200306241116.h5OBGnp06718@moulon.inra.fr…

···

Is this behaviour common? Or I did something wrong.

No, the problem is in yaml which make reference to Kernel::Hash rather
than Object::Hash

Guy Decoux

5

Hi,

···

At Tue, 24 Jun 2003 20:16:53 +0900, ts wrote:

Is this behaviour common? Or I did something wrong.

No, the problem is in yaml which make reference to Kernel::Hash rather
than Object::Hash

::Hash wouldn’t be better?

–
Nobu Nakada

6

If that's true, then how come it did not give any error on windows?

It depend on the ruby version

svg% /usr/bin/ruby -ve 'p Kernel::Hash'
ruby 1.8.0 (2003-05-13) [i686-linux]
Hash
svg%

svg% ./ruby -ve 'p Kernel::Hash'
ruby 1.8.0 (2003-06-24) [i686-linux]
-e:1: warning: toplevel constant Hash referenced by Kernel::Hash
Hash
svg%

Guy Decoux

7

::Hash wouldn't be better?

Yes, this is just that I've not understood why he try to reference
Kernel::Hash (confusion between Kernel and Object for ::Hash ???)

Guy Decoux

8

It looks like almost anything would be better:

~$ ruby -v
ruby 1.8.0 (2003-06-23) [i686-linux]
~$ ruby -w
a = Kernel::Hash.new
b = Object::Hash.new
c = ::Hash.new
d = Hash.new
-:1: warning: toplevel constant Hash referenced by Kernel::Hash

Personally, I think Object::Hash, Kernel::Hash are silly, and ::Hash is ugly.
Why not just say “Hash”?

Jason Creighton

···

On Thu, 26 Jun 2003 09:46:50 +0900 nobu.nokada@softhome.net wrote:

Hi,

At Tue, 24 Jun 2003 20:16:53 +0900, > ts wrote:

Is this behaviour common? Or I did something wrong.

No, the problem is in yaml which make reference to Kernel::Hash rather
than Object::Hash

::Hash wouldn’t be better?

9

Thanks ts,

I download the new ruby-1.8preview3 for both the linux and the
windows(mswin32) version and run your command. Now both give me the same
warnings.

Ruby - MSWIN32
c:> c:\apps\ruby\bin\ruby -ve ‘p Kernel::Hash’
ruby 1.8.0 (2003-06-23) [i386-mswin32]
-e:1: warning: toplevel constant Hash referenced by Kernel::Hash
Hash
c:>

Ruby - Linux

% ruby -ve ‘p Kernel::Hash’
ruby 1.8.0 (2003-06-23) [i686-linux]
-e:1: warning: toplevel constant Hash referenced by Kernel::Hash
Hash
%

“ts” decoux@moulon.inra.fr wrote in message
news:200306241432.h5OEWgJ11444@moulon.inra.fr…

···

If that’s true, then how come it did not give any error on windows?

It depend on the ruby version

svg% /usr/bin/ruby -ve ‘p Kernel::Hash’
ruby 1.8.0 (2003-05-13) [i686-linux]
Hash
svg%

svg% ./ruby -ve ‘p Kernel::Hash’
ruby 1.8.0 (2003-06-24) [i686-linux]
-e:1: warning: toplevel constant Hash referenced by Kernel::Hash
Hash
svg%

Guy Decoux

10

Sorry. When I originally wrote that code, I was under the impression that
Kernel was the top level namespace. I will change to ::Hash, if it will
avoid further ambiguity. Thank you.

_why

···

On Thursday 26 June 2003 03:10 am, ts wrote:

Yes, this is just that I’ve not understood why he try to reference
Kernel::Hash (confusion between Kernel and Object for ::Hash ???)

11

Hi,

Personally, I think Object::Hash, Kernel::Hash are silly, and ::Hash is ugly.
Why not just say “Hash”?

Sometimes you have to stand ugliness, when Hash may be overridden.

class Foo
Hash = {}
def foo
p Hash
p ::Hash
end
end
Foo.new.foo

=> {}
Hash

···

In message “Re: Warning error in YAML” on 03/06/27, Jason Creighton androflux@softhome.net.remove.to.reply writes:

						matz.