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Regressed in https://github.com/scala/scala/pull/2848. In particular,
see 0cf47bdb5b and 017460e63c.
Because of the regression, this pattern:
(s @ (_s @ (_: String)))
was translated into `typeTestStep`, rather than a `bindingStep`. This
came down the the use of `unbind` in the `TypeBound` extractor.
My first step was to remove the `unbind`. That led to another
problem: the tree now matches `SymbolAndTypeBound`, which extracted
`symbol = s, tpe = String`, ignoring the `_s`. I changed that
extractor to no longer recursively apply to the sub-pattern tree,
which is what `MaybeTypedBound` used to do.
I also checked for other uses of `unbind` in the match translation.
The only place I found it is in `BoundTree#pt`. I believe that this
usage is correct, or at least, not obviously incorrect.
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