Rollup merge of #72206 - sergey-melnychuk:cleanup-stale-fixme, r=petrochenkov

Cleanup stale 'FIXME(#64197)'

(My first PR in rust-lang, any feedback is welcome. Please don't hesitate to let me know if I'm trying to do something pointless!)

Trivial cleanup of a stale `FIXME`, `StringReader.pos` is no longer exposed. For testing added `pos()` method that returns cloned value of `pos`.

Author: Dylan-DPC

src/librustc_expand/parse/lexer/tests.rs

@@ -50,13 +50,13 @@ fn t1() {
         assert_eq!(string_reader.next_token(), token::Whitespace);
         // Read another token.
         let tok3 = string_reader.next_token();
-        assert_eq!(string_reader.pos.clone(), BytePos(28));
+        assert_eq!(string_reader.pos(), BytePos(28));
         let tok4 = Token::new(mk_ident("main"), Span::with_root_ctxt(BytePos(24), BytePos(28)));
         assert_eq!(tok3.kind, tok4.kind);
         assert_eq!(tok3.span, tok4.span);
 
         assert_eq!(string_reader.next_token(), token::OpenDelim(token::Paren));
-        assert_eq!(string_reader.pos.clone(), BytePos(29))
+        assert_eq!(string_reader.pos(), BytePos(29))
     })
 }
 

src/librustc_parse/lexer/mod.rs

@@ -31,8 +31,7 @@ pub struct StringReader<'a> {
     /// Initial position, read-only.
     start_pos: BytePos,
     /// The absolute offset within the source_map of the current character.
-    // FIXME(#64197): `pub` is needed by tests for now.
-    pub pos: BytePos,
+    pos: BytePos,
     /// Stop reading src at this index.
     end_src_index: usize,
     /// Source text to tokenize.
@@ -436,6 +435,10 @@ impl<'a> StringReader<'a> {
         }
     }
 
+    pub fn pos(&self) -> BytePos {
+        self.pos
+    }
+
     #[inline]
     fn src_index(&self, pos: BytePos) -> usize {
         (pos - self.start_pos).to_usize()