Convert a &mut self to &self.

nnethercote · nnethercote · commit bbcfd90cd17a · 2024-08-14T13:06:57.000+10:00
diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
@@ -1206,7 +1206,7 @@ impl<'a> Parser<'a> {
     }
 
     fn mk_expr_tuple_field_access(
-        &mut self,
+        &self,
         lo: Span,
         ident_span: Span,
         base: P<Expr>,
