[ruby-talk:26107] What am I missing here?

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Adding a function doesnt find the global variable $_ where as Kernel.instance_eval does.

What am  I missing here?

irb(main):001:0> $_="ruby"
"ruby"
irb(main):002:0> module Kernel ; def upcase ; $_.upcase! ; end ; end
nil
irb(main):003:0> upcase
NameError: undefined method `upcase!' for nil
(irb):2:in `upcase'
(irb):3:in `irb_binding'
irb(main):004:0> Kernel.instance_eval("$_.upcase!")
"RUBY"
irb(main):005:0>

Ralph


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<DIV><FONT face=Arial size=2>Adding a function doesnt find the global variable 
$_ where as Kernel.instance_eval does.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>What am&nbsp; I missing here?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>irb(main):001:0&gt; 
$_="ruby"<BR>"ruby"<BR>irb(main):002:0&gt; module Kernel ; def upcase ; 
$_.upcase! ; end ; end<BR>nil<BR>irb(main):003:0&gt; upcase<BR>NameError: 
undefined method `upcase!' for nil<BR>(irb):2:in `upcase'<BR>(irb):3:in 
`irb_binding'<BR>irb(main):004:0&gt; 
Kernel.instance_eval("$_.upcase!")<BR>"RUBY"<BR>irb(main):005:0&gt;</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Ralph</FONT></DIV>
<DIV>&nbsp;</DIV></BODY></HTML>

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