Hi,
I'm running perl 5.12.2 on Windows: 
use warnings;

%h = ( '512_x64' => '24', 'world' => 'hello');

print $h{world}, "\n";   # line 5
print $h{512_x64}, "\n"; # line 6

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The output: 
Misplaced _ in number at try.pl line 6.
hello
Use of uninitialized value in print at try.pl line 6.

[download]
Given that I don't have to put the string world in quotes at line 5, I'm a bit peeved that I *do* have to put the string 512_x64 in quotes at line 6.

Is that the way it's supposed to be ?

Cheers,
Rob

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