Auto merge of #131466 - matthiaskrgr:rollup-3qtz83x, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #123951 (Reserve guarded string literals (RFC 3593))
 - #130827 (Library: Rename "object safe" to "dyn compatible")
 - #131383 (Add docs about slicing slices at the ends)
 - #131403 (Fix needless_lifetimes in rustc_serialize)
 - #131417 (Fix methods alignment on mobile)
 - #131449 (Decouple WASIp2 sockets from WasiFd)
 - #131462 (Mention allocation errors for `open_buffered`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

crates/parser/src/lexed_str.rs

@@ -187,6 +187,12 @@ impl<'a> Converter<'a> {
                 }
 
                 rustc_lexer::TokenKind::RawIdent => IDENT,
+
+                rustc_lexer::TokenKind::GuardedStrPrefix => {
+                    err = "Invalid string literal (reserved syntax)";
+                    ERROR
+                },
+
                 rustc_lexer::TokenKind::Literal { kind, .. } => {
                     self.extend_literal(token_text.len(), kind);
                     return;