Nested TAP

[Ovid]

One issue we covered at the Hackathon was how to do nested TAP.  The
suggestion that was adopted was not backwards-compatible, but it was
felt this was OK because the TAP consumer specifically had to request
this.

I hated this decision, but was hard-pressed to argue against it because
making things backwards-compatible seemed to involve putting a
full-blown parser into the TAP producer.  (In other words, sort of like
embedding Test::Harness into Test::Builder).  I *think* I've figured
out how to make things backwards-compatible and not require a parser. 
The background is here:

  http://use.perl.org/~Ovid/journal/36120

Cheers,
Ovid

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