diff --git a/sub/_macros/src/patterns.rs b/sub/_macros/src/patterns.rs
index 14dc055..4ede814 100644
--- a/sub/_macros/src/patterns.rs
+++ b/sub/_macros/src/patterns.rs
@@ -11,7 +11,7 @@ pub fn proc_pattern(input: TokenStream) -> TokenStream {
 
     let string = match &input[..] {
         [TokenTree::Literal(lit)] => parse_str_literal(&lit),
-        _ => panic!("expected a single string literal to parse"),
+        _e => panic!("expected a single string literal to parse, got: {_e:?}"),
     };
 
     let pattern = match parse(&string) {