test/peano: use directly recursive type def
test/peano: use directly recursive type def

Test case for http://code.google.com/p/go/issues/detail?id=999

R=r
CC=golang-dev
http://codereview.appspot.com/1892050

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

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