Improve readability

Author: matklad

crates/hir_def/src/body.rs

@@ -105,14 +105,16 @@ impl Expander {
 
         let macro_call = InFile::new(self.current_file_id, &macro_call);
 
-        if let Some(call_id) = macro_call.as_call_id(db, self.crate_def_map.krate, |path| {
+        let resolver = |path: ModPath| -> Option<MacroDefId> {
             if let Some(local_scope) = local_scope {
                 if let Some(def) = path.as_ident().and_then(|n| local_scope.get_legacy_macro(n)) {
                     return Some(def);
                 }
             }
             self.resolve_path_as_macro(db, &path)
-        }) {
+        };
+
+        if let Some(call_id) = macro_call.as_call_id(db, self.crate_def_map.krate, resolver) {
             let file_id = call_id.as_file();
             if let Some(node) = db.parse_or_expand(file_id) {
                 if let Some(expr) = T::cast(node) {