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freebsd-ports/devel/p5-Commands-Guarded/pkg-descr
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This module implements a deterministic, rectifying variant on Dijkstra's
guarded commands. Each named step is passed two blocks: an "ensure"
block that defines a test for a necessary and sufficient condition of
the step, and a "using" block that will cause that condition to obtain.
WWW: http://search.cpan.org/dist/Commands-Guarded/