Rollup merge of #108801 - fee1-dead-contrib:c-str, r=compiler-errors

Implement RFC 3348, `c"foo"` literals

RFC: https://github.com/rust-lang/rfcs/pull/3348
Tracking issue: #105723

compiler/rustc_parse/src/parser/expr.rs

@@ -1870,6 +1870,7 @@ impl<'a> Parser<'a> {
         let recovered = self.recover_after_dot();
         let token = recovered.as_ref().unwrap_or(&self.token);
         let span = token.span;
+
         token::Lit::from_token(token).map(|token_lit| {
             self.bump();
             (token_lit, span)