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vim.notify cannot be suppressed and it is not always necessary to display a visible warning to the user if the RPC process fails to start. For instance, a user may have the same LSP configuration across systems, some of which may not have all of the LSP server executables installed. In that case, the user receives a notification every time a file is opened that they cannot suppress. Instead of using vim.notify in vim.lsp.rpc, propagate a normal error up through the call stack and use vim.notify in vim.lsp.start() only if the "silent" option is not set. This also updates lsp.start_client() to return an error message as its second return value if an error occurred, rather than calling vim.notify directly. Callers of lsp.start_client() will need to update call sites appropriately if they wish to report errors to the user (or even better, switch to vim.lsp.start).