Auto merge of #76160 - scileo:format-recovery, r=petrochenkov

Improve recovery on malformed format call

The token following a format expression should be a comma. However, when it is replaced with a similar token (such as a dot), then the corresponding error is emitted, but the token is treated as a comma, and the parsing step continues.

r? @petrochenkov

compiler/rustc_parse/src/parser/mod.rs

@@ -1234,6 +1234,10 @@ impl<'a> Parser<'a> {
                 *t == token::OpenDelim(token::Brace) || *t == token::BinOp(token::Star)
             })
     }
+
+    pub fn clear_expected_tokens(&mut self) {
+        self.expected_tokens.clear();
+    }
 }
 
 crate fn make_unclosed_delims_error(