Original post here: Can't get rust-analyzer working · Issue #1164 · neovim/nvim-lspconfig · GitHub. Was directed here.
The above is quite detailed but I’ll post a summary here.
rust-analyzer using the instructions here User Manual. Upon opening a rust file I saw
cmd ["rust-analyzer"] is not executable. Ran
chmod a+x /PATH/TO/rust-analyzer. Re-opened the rust project and saw this new error.
Error detected while processing FileType Autocommands for "rust": E5108: Error executing lua ...llar/neovim/0.5.0/share/nvim/runtime/lua/vim/lsp/rpc.lua:384: start `rust-analyzer` faile d: Unknown system error -86: Unknown system error -86
No idea why.