Migrate to using variables directly in format strings

`clippy` recently added a new lint that encourages the use of
variables directly in format strings rather than as positional
arguments. While its not the most critical thing, its right, so
here we transition to inline variables in format strings.

Author: TheBlueMatt

lightning-macros/src/lib.rs

@@ -83,7 +83,7 @@ pub fn maybe_await(expr: TokenStream) -> TokenStream {
 fn expect_ident(token: &TokenTree, expected_name: Option<&str>) {
 	if let TokenTree::Ident(id) = &token {
 		if let Some(exp) = expected_name {
-			assert_eq!(id.to_string(), exp, "Expected ident {}, got {:?}", exp, token);
+			assert_eq!(id.to_string(), exp, "Expected ident {exp}, got {token:?}");
 		}
 	} else {
 		panic!("Expected ident {:?}, got {:?}", expected_name, token);
@@ -92,9 +92,9 @@ fn expect_ident(token: &TokenTree, expected_name: Option<&str>) {
 
 fn expect_punct(token: &TokenTree, expected: char) {
 	if let TokenTree::Punct(p) = &token {
-		assert_eq!(p.as_char(), expected, "Expected punctuation {}, got {}", expected, p);
+		assert_eq!(p.as_char(), expected, "Expected punctuation {expected}, got {p}");
 	} else {
-		panic!("Expected punctuation {}, got {:?}", expected, token);
+		panic!("Expected punctuation {expected}, got {token:?}");
 	}
 }