proc-macro-srv: Fix <TokenStream as Display>::fmt impl rendering puncts as u8

Author: Veykril

src/tools/rust-analyzer/crates/proc-macro-srv/src/tests/mod.rs

@@ -228,7 +228,7 @@ fn test_derive_error() {
             IDENT 1 compile_error
             PUNCT 1 ! [joint]
             GROUP () 1 1 1
-              LITER 1 Str #[derive(DeriveError)] struct S {field 58 u32}
+              LITER 1 Str #[derive(DeriveError)] struct S {field : u32}
             PUNCT 1 ; [alone]
         "#]],
         expect![[r#"
@@ -242,9 +242,9 @@ fn test_derive_error() {
 
             IDENT 42:Root[0000, 0]@0..13#ROOT2024 compile_error
             PUNCT 42:Root[0000, 0]@13..14#ROOT2024 ! [joint]
-            GROUP () 42:Root[0000, 0]@14..15#ROOT2024 42:Root[0000, 0]@63..64#ROOT2024 42:Root[0000, 0]@14..64#ROOT2024
-              LITER 42:Root[0000, 0]@15..63#ROOT2024 Str #[derive(DeriveError)] struct S {field 58 u32}
-            PUNCT 42:Root[0000, 0]@64..65#ROOT2024 ; [alone]
+            GROUP () 42:Root[0000, 0]@14..15#ROOT2024 42:Root[0000, 0]@62..63#ROOT2024 42:Root[0000, 0]@14..63#ROOT2024
+              LITER 42:Root[0000, 0]@15..62#ROOT2024 Str #[derive(DeriveError)] struct S {field : u32}
+            PUNCT 42:Root[0000, 0]@63..64#ROOT2024 ; [alone]
         "#]],
     );
 }

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

@@ -475,7 +475,7 @@ fn display_token_tree<S>(
         }
         TokenTree::Punct(Punct { ch, joint, span: _ }) => {
             *emit_whitespace = !*joint;
-            write!(f, "{ch}")?;
+            write!(f, "{}", *ch as char)?;
         }
         TokenTree::Ident(Ident { sym, is_raw, span: _ }) => {
             if *is_raw {
@@ -745,14 +745,10 @@ mod tests {
     use super::*;
 
     #[test]
-    fn roundtrip() {
-        let token_stream = TokenStream::from_str("struct T {\"string\"}", ()).unwrap();
-        assert_eq!(token_stream.to_string(), "struct T {\"string\"}");
-    }
-
-    #[test]
-    fn ident_ts_no_trailing_whitespace_to_string() {
-        let token_stream = TokenStream::from_str("this_is_an_ident", ()).unwrap();
-        assert_eq!(token_stream.to_string(), "this_is_an_ident");
+    fn ts_to_string() {
+        let token_stream =
+            TokenStream::from_str("{} () [] <> ;/., \"gfhdgfuiofghd\" 0f32 r#\"dff\"# 'r#lt", ())
+                .unwrap();
+        assert_eq!(token_stream.to_string(), "{}()[]<> ;/., \"gfhdgfuiofghd\"0f32 r#\"dff\"#'r#lt");
     }
 }