Commits on Jul 3, 2020

1. 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.

   

   matklad committed Jul 3, 2020
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