Remove checking file exists

Author: edwin0cheng

crates/ra_lsp_server/src/server_world.rs

@@ -11,7 +11,7 @@ use ra_ide_api::{
 use ra_vfs::{Vfs, VfsChange, VfsFile, VfsRoot};
 use relative_path::RelativePathBuf;
 use parking_lot::RwLock;
-use failure::format_err;
+use failure::{Error, format_err};
 use gen_lsp_server::ErrorCode;
 
 use crate::{
@@ -155,18 +155,11 @@ impl ServerWorld {
     pub fn uri_to_file_id(&self, uri: &Url) -> Result<FileId> {
         let path = uri.to_file_path().map_err(|()| format_err!("invalid uri: {}", uri))?;
         let file = self.vfs.read().path2file(&path).ok_or_else(|| {
-            // Check whether give path is exists,
-            // if so, maybe this file is outside out current workspace
-            if path.exists() {
-                LspError {
-                    code: ErrorCode::InvalidRequest as i32,
-                    message: "Rust file outside current workspace is not supported yet."
-                        .to_string(),
-                }
-                .into()
-            } else {
-                format_err!("unknown file: {}", path.display())
-            }
+            // Show warning as this file is outside current workspace
+            Error::from(LspError {
+                code: ErrorCode::InvalidRequest as i32,
+                message: "Rust file outside current workspace is not supported yet.".to_string(),
+            })
         })?;
         Ok(FileId(file.0.into()))
     }