Aleksey Kladov 058c1b60a5 Add rust-analyzer submodule ...

The current plan is that submodule tracks the `release` branch of
rust-analyzer, which is updated once a week.

rust-analyzer is a workspace (with a virtual manifest), the actual
binary is provide by `crates/rust-analyzer` package.

Note that we intentionally don't add rust-analyzer to `Kind::Test`,
for two reasons.

*First*, at the moment rust-analyzer's test suite does a couple of
things which might not work in the context of rust repository. For
example, it shells out directly to `rustup` and `rustfmt`. So, making
this work requires non-trivial efforts.

*Second*, it seems unlikely that running tests in rust-lang/rust repo
would provide any additional guarantees. rust-analyzer builds with
stable and does not depend on the specifics of the compiler, so
changes to compiler can't break ra, unless they break stability
guarantee. Additionally, rust-analyzer itself is gated on bors, so we
are pretty confident that test suite passes.

2020-07-03 16:55:35 +02:00

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