test(general): Introduce macros for traversing Annotated #826
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This is WIP to experiment with the API for an Annotated traversal macro.
This ended up as a macro since code generation is required for accessing fields and inferring the types. There are two macros:
get_path!(foo.bar.baz)
gets theAnnotated
at the path.get_value!(foo.bar.baz)
gets the inner value at the path.Both return an
Option
. There is an alternate form for bothget_{path,value}!(foo.bar.baz!)
that unwraps the path.#skip-changelog