1 files changed, 12 insertions, 3 deletions
diff --git a/rust/macros/paste.rs b/rust/macros/paste.rs
index f40d42b35b58..6529a387673f 100644
--- a/rust/macros/paste.rs
+++ b/rust/macros/paste.rs
@@ -2,7 +2,7 @@
 
 use proc_macro::{Delimiter, Group, Ident, Spacing, Span, TokenTree};
 
-fn concat(tokens: &[TokenTree], group_span: Span) -> TokenTree {
+fn concat_helper(tokens: &[TokenTree]) -> Vec<(String, Span)> {
     let mut tokens = tokens.iter();
     let mut segments = Vec::new();
     let mut span = None;
@@ -46,12 +46,21 @@ fn concat(tokens: &[TokenTree], group_span: Span) -> TokenTree {
                 };
                 segments.push((value, sp));
             }
-            _ => panic!("unexpected token in paste segments"),
+            Some(TokenTree::Group(group)) if group.delimiter() == Delimiter::None => {
+                let tokens = group.stream().into_iter().collect::<Vec<TokenTree>>();
+                segments.append(&mut concat_helper(tokens.as_slice()));
+            }
+            token => panic!("unexpected token in paste segments: {:?}", token),
         };
     }
 
+    segments
+}
+
+fn concat(tokens: &[TokenTree], group_span: Span) -> TokenTree {
+    let segments = concat_helper(tokens);
     let pasted: String = segments.into_iter().map(|x| x.0).collect();
-    TokenTree::Ident(Ident::new(&pasted, span.unwrap_or(group_span)))
+    TokenTree::Ident(Ident::new(&pasted, group_span))
 }
 
 pub(crate) fn expand(tokens: &mut Vec<TokenTree>) {