6909556435
Use proc-macro-srv from sysroot in rust-project.json workspaces This was discussed [on zulip](https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/.60sysroot.60.20vs.20.60sysroot_src.60.20for.20.60rust-project.2Ejson.60.3F/near/293023920), basically in `rust-project.json` workspaces RA doesn't respect the `sysroot` setting when picking which `proc-macro-srv` to launch, and this causes abi mismatches in practice. This is the simple fix that `@Veykril` suggested, and I've verified that it works on Fuchsia by inspecting the cmdline with `pgrep rust-analyzer | xargs ps -fp` to check that it's using the `proc-macro-srv` from our prebuilts which matches the `sysroot` specified in our `rust-project.json`. Can this be merged as is, or do we need to add tests that exercise this?
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