Recover fn keyword as Fn trait in bounds

compiler/rustc_expand/src/build.rs

@@ -626,7 +626,7 @@ impl<'a> ExtCtxt<'a> {
 
     // Builds `#[name = val]`.
     //
-    // Note: `span` is used for both the identifer and the value.
+    // Note: `span` is used for both the identifier and the value.
     pub fn attr_name_value_str(&self, name: Symbol, val: Symbol, span: Span) -> ast::Attribute {
         let g = &self.sess.parse_sess.attr_id_generator;
         attr::mk_attr_name_value_str(g, ast::AttrStyle::Outer, name, val, span)