phabricator: avoid a stacktrace when command arguments are missing Previously, the TypeError wasn't properly converted to a SignatureError when improper arguments were supplied to the inner function, because the stack depth is 2 inside the vcrcommand decorator. The `__name__` and `__doc__` attributes need to be reassigned to the new wrapper so that the help summary is available. Differential Revision: https://phab.mercurial-scm.org/D8209

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  $ echo "[extensions]" >> $HGRCPATH

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  $ echo "mq=" >> $HGRCPATH

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  $ hg init

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  $ echo 'base' > base

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  $ hg ci -Ambase

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  adding base

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  $ hg qnew -mmqbase mqbase

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  $ hg qsave

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  $ hg qrestore 2

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  restoring status: hg patches saved state

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