Simpify code

crates/ra_proc_macro_srv/src/lib.rs

@@ -23,7 +23,7 @@ use proc_macro::bridge::client::TokenStream;
 use ra_proc_macro::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask};
 use std::{
     collections::{hash_map::Entry, HashMap},
-    fs::metadata,
+    fs,
     path::{Path, PathBuf},
     time::SystemTime,
 };
@@ -50,9 +50,9 @@ impl ProcMacroSrv {
     }
 
     fn expander(&mut self, path: &Path) -> Result<&dylib::Expander, String> {
-        let time = metadata(path)
-            .and_then(|it| it.modified())
-            .map_err(|err| format!("Failed to file metadata for {}: {:?}", path.display(), err))?;
+        let time = fs::metadata(path).and_then(|it| it.modified()).map_err(|err| {
+            format!("Failed to get file metadata for {}: {:?}", path.display(), err)
+        })?;
 
         Ok(match self.expanders.entry((path.to_path_buf(), time)) {
             Entry::Vacant(v) => v.insert(dylib::Expander::new(path).map_err(|err| {