error: invalid unicode character escape --> $DIR/literals-are-validated-before-expansion.rs:6:20 | LL | black_hole! { '\u{FFFFFF}' } | ^^^^^^^^^^ | = help: unicode escape must be at most 10FFFF error: invalid unicode character escape --> $DIR/literals-are-validated-before-expansion.rs:8:39 | LL | black_hole! { "this is surrogate: \u{DAAA}" } | ^^^^^^^^ | = help: unicode escape must not be a surrogate error: aborting due to 2 previous errors