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params of lambda expressions.
(ruby-smie--implicit-semi-p): Refine rule.
(ruby-smie--opening-pipe-p): New function.
(ruby-smie--forward-token, ruby-smie--backward-token): Handle Ruby
symbols and matched |...| for formal params.
(ruby-smie-rules): Don't let the formal params of a "do" prevent it
from being treated as hanging.  Handle "rescue".

Fixes: debbugs:15208