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And move crates from regular to dev-dependencies when they're only used in tests.
Found by the unused crate lint and removed to help prevent unnecessary dependency hell when upgrading hyper to 1.0, but committed separately from enabling the lint permanently.
This lint has a number of "false positives" that are due to being unable to specify per-target dependencies; see these issues for more info:
unused_crate_dependenciesfalse-positives in Cargo packages with muliple Cargo Targets (lib, bins, examples, tests, benches) rust-lang/rust#95513I'm most interested in the first commit here that cleans up existing unused crates.
I won't be offended if you don't want the second commit that will make you have to clean up or explicitly allow actual unused crates or false positives going forward. I'm happy to rebase out the 2nd commit, just say the word!