1ee142d8bd
Adds `manual_rule!` which provides a more low-level interface for defining rewrites. (I'm not entirely sold on the name, so any suggestions would be welcome.) Notably, the captures bound in the body of such rules have _not_ been translated yet -- they still come from the _input_ tree. It is the user's duty to call ctx.translate on these (which has the effect of recursively invoking the translation) before substituting them into the output. For _truly_ low-level access, the user can still construct a Rule directly, but this is now somewhat cumbersome as the closure contained therein takes quite a few parameters. Still, the possibility remains.
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