In 5 extension traits definitions use "extend" to remove boilerplate, and drop one now-unneded trait

Ian Jacksonrequested to merge
Diziet/arti:extend into main

Using a macro makes this extension trait pattern easier and less repetitive.

There are five libraries on crates.io for this:

  • extend and ext: Both reasonable candidates. I tried out both in a personal project and settled on extend (because it handled a case I wanted).
  • extension-trait has very sparse docs.
  • extension-traits and ext-trait seem to be by the same person? The usage isn't as good.

diffstat on .rs files of the extension trait commits is 5 files changed, 25 insertions(+), 56 deletions(-)

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