Use #[expect(lint)] over #[allow(lint)] where possible (#17822)

crates/ruff_python_parser/src/lexer.rs

@@ -1459,7 +1459,7 @@ impl<'src> Lexer<'src> {
 
     /// Retrieves the current offset of the cursor within the source code.
     // SAFETY: Lexer doesn't allow files larger than 4GB
-    #[allow(clippy::cast_possible_truncation)]
+    #[expect(clippy::cast_possible_truncation)]
     #[inline]
     fn offset(&self) -> TextSize {
         TextSize::new(self.source.len() as u32) - self.cursor.text_len()

crates/ruff_python_parser/src/lexer/cursor.rs

@@ -62,7 +62,7 @@ impl<'src> Cursor<'src> {
     ///
     /// Use [`Cursor::rest`] to get the remaining text.
     // SAFETY: The `source.text_len` call in `new` would panic if the string length is larger than a `u32`.
-    #[allow(clippy::cast_possible_truncation)]
+    #[expect(clippy::cast_possible_truncation)]
     pub(super) fn text_len(&self) -> TextSize {
         TextSize::new(self.chars.as_str().len() as u32)
     }

crates/ruff_python_parser/src/token_source.rs

@@ -210,7 +210,7 @@ pub(crate) struct TokenSourceCheckpoint {
 /// of `contents`.
 ///
 /// See [#9546](https://github.com/astral-sh/ruff/pull/9546) for a more detailed explanation.
-#[allow(dead_code)]
+#[expect(dead_code)]
 fn allocate_tokens_vec(contents: &str) -> Vec<Token> {
     let lower_bound = contents.len().saturating_mul(15) / 100;
     Vec::with_capacity(lower_bound)

crates/ruff_python_parser/tests/fixtures.rs

@@ -274,7 +274,7 @@ fn extract_options(source: &str) -> Option<ParseOptions> {
 // Use it for quickly debugging a parser issue.
 #[test]
 #[ignore]
-#[allow(clippy::print_stdout)]
+#[expect(clippy::print_stdout)]
 fn parser_quick_test() {
     let source = "\
 f'{'