Fix build warning

Author: autozimu

src/rpchandler.rs

@@ -1,4 +1,5 @@
 use super::*;
+use super::types::OptionDeref;
 use crate::language_client::LanguageClient;
 use crate::lsp::notification::Notification;
 use crate::lsp::request::Request;
@@ -7,7 +8,7 @@ impl LanguageClient {
     pub fn handle_call(&self, msg: Call) -> Fallible<()> {
         match msg {
             Call::MethodCall(lang_id, method_call) => {
-                let result = self.handle_method_call(lang_id.as_deref(), &method_call);
+                let result = self.handle_method_call(OptionDeref::as_deref(&lang_id), &method_call);
                 if let Err(ref err) = result {
                     if err.find_root_cause().downcast_ref::<LCError>().is_none() {
                         error!(
@@ -22,7 +23,7 @@ impl LanguageClient {
                     .output(method_call.id.to_int()?, result)?;
             }
             Call::Notification(lang_id, notification) => {
-                let result = self.handle_notification(lang_id.as_deref(), &notification);
+                let result = self.handle_notification(OptionDeref::as_deref(&lang_id), &notification);
                 if let Err(ref err) = result {
                     if err.downcast_ref::<LCError>().is_none() {
                         error!(

src/vim.rs

@@ -1,4 +1,5 @@
 use super::*;
+use super::types::OptionDeref;
 use crate::rpcclient::RpcClient;
 use crate::sign::Sign;
 use crate::viewport::Viewport;
@@ -148,7 +149,7 @@ impl Vim {
 
     pub fn edit(&self, goto_cmd: &Option<String>, path: impl AsRef<Path>) -> Fallible<()> {
         let path = path.as_ref().to_string_lossy();
-        let goto = goto_cmd.as_deref().unwrap_or("edit");
+        let goto = OptionDeref::as_deref(goto_cmd).unwrap_or("edit");
         self.rpcclient.notify("s:Edit", json!([goto, path]))?;
         Ok(())
     }