Nil.to_splat

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% ./ruby -ve ‘def nil.to_splat() [3423] end; p [0,*nil]’
ruby 1.9.0 (2007-07-05 patchlevel 0) [i686-linux]
-e:1: warning: method redefined; discarding old to_splat
[0]

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% ./ruby -ve ’
def nil.to_splat() [3423] end
p [*nil]’
ruby 1.9.0 (2007-07-05 patchlevel 0) [i686-linux]
-e:2: warning: method redefined; discarding old to_splat
[3423]