Validate that registered args begin with dashes, as appropriate.

Review Request #1211 - Created Oct. 23, 2014 and submitted

Information
Benjy Weinberger
pants
7da31d2...
Reviewers
pants-reviews
zundel

Otherwise we get a cryptic error further along.

CI baking. Verified that bad registration triggers these validation checks.

Eric Ayers
Benjy Weinberger
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted in 8d21e7178a1f514f450005753ec3edce94f67928.
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