fix: Fix TokenStream::to_string implementation dropping quotation marks

Author: Veykril

src/tools/rust-analyzer/crates/proc-macro-srv/src/server_impl/rust_analyzer_span.rs

@@ -507,12 +507,17 @@ mod tests {
                         close: span,
                         kind: tt::DelimiterKind::Brace,
                     },
-                    token_trees: Box::new([]),
+                    token_trees: Box::new([tt::TokenTree::Leaf(tt::Leaf::Literal(tt::Literal {
+                        kind: tt::LitKind::Str,
+                        symbol: Symbol::intern("string"),
+                        suffix: None,
+                        span,
+                    }))]),
                 }),
             ],
         };
 
-        assert_eq!(s.to_string(), "struct T {}");
+        assert_eq!(s.to_string(), "struct T {\"string\"}");
     }
 
     #[test]

src/tools/rust-analyzer/crates/tt/src/lib.rs

@@ -603,7 +603,7 @@ pub fn pretty<S>(tkns: &[TokenTree<S>]) -> String {
             TokenTree::Leaf(Leaf::Ident(ident)) => {
                 format!("{}{}", ident.is_raw.as_str(), ident.sym)
             }
-            TokenTree::Leaf(Leaf::Literal(literal)) => literal.symbol.as_str().to_owned(),
+            TokenTree::Leaf(Leaf::Literal(literal)) => format!("{literal}"),
             TokenTree::Leaf(Leaf::Punct(punct)) => format!("{}", punct.char),
             TokenTree::Subtree(subtree) => {
                 let content = pretty(&subtree.token_trees);