Use clone to clone DelimArgs in two places.

compiler/rustc_ast_lowering/src/lib.rs

@@ -916,7 +916,7 @@ fn alias_attrs(&mut self, id: HirId, target_id: HirId) {
     }
 
     fn lower_delim_args(&self, args: &DelimArgs) -> DelimArgs {
-        DelimArgs { dspan: args.dspan, delim: args.delim, tokens: args.tokens.clone() }
+        args.clone()
     }
 
     /// Lower an associated item constraint.

compiler/rustc_attr_parsing/src/context.rs

@@ -3,7 +3,7 @@
 use std::ops::Deref;
 use std::sync::LazyLock;
 
-use rustc_ast::{self as ast, DelimArgs};
+use rustc_ast as ast;
 use rustc_attr_data_structures::AttributeKind;
 use rustc_errors::{DiagCtxtHandle, Diagnostic};
 use rustc_feature::Features;
@@ -315,11 +315,7 @@ pub fn parse_attribute_list<'a>(
     fn lower_attr_args(&self, args: &ast::AttrArgs, lower_span: impl Fn(Span) -> Span) -> AttrArgs {
         match args {
             ast::AttrArgs::Empty => AttrArgs::Empty,
-            ast::AttrArgs::Delimited(args) => AttrArgs::Delimited(DelimArgs {
-                dspan: args.dspan,
-                delim: args.delim,
-                tokens: args.tokens.clone(),
-            }),
+            ast::AttrArgs::Delimited(args) => AttrArgs::Delimited(args.clone()),
             // This is an inert key-value attribute - it will never be visible to macros
             // after it gets lowered to HIR. Therefore, we can extract literals to handle
             // nonterminals in `#[doc]` (e.g. `#[doc = $e]`).