Fix occasional failure to generate rustdoc when RUSTFLAGS="-Dwarnings".
#643
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obi1kenobi
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RUSTFLAGS="-Dwarnings".
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Generating rustdoc JSON for a crate also involves checking that crate's dependencies. The check is done by rustc, not rustdoc, so it's subject to
RUSTFLAGSnotRUSTDOCFLAGS. We don't want rustc to fail that check if the user has setRUSTFLAGS="-Dwarnings"here.We resolve this by appending
--cap-lints=allowtoRUSTFLAGS, which thankfully overrides prior lint-related commands like-Dwarnings.Fixes: #589