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bug#15594: trunk r114639: * lisp/progmodes/ruby-mode.el (ruby-smie-gramm

From: Stefan Monnier
Subject: bug#15594: trunk r114639: * lisp/progmodes/ruby-mode.el (ruby-smie-grammar): Add rule for paren-free
Date: Mon, 21 Oct 2013 09:25:07 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

>> Calling ruby-smie--forward-token is a bit dangerous since that function
>> might itself be called from ruby-smie--forward-token.  It might work,
>> but you'll have to think hard about why an inf-loop is not possible.
> Hopefully because both `ruby-smie--forward-token' and
> ruby-smie--backward-token' would only call `ruby-smie--forward-token', and
> only when (> pos (point)), IOW there has to be some whitespace skipping done
> between the recursive calls.

Only recursing in one direction (only forward or only backward) is
a good way to guarantee progress, indeed.  But currently
ruby-smie--implicit-semi-p calls ruby-smie--backward-token, so beware.


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