error: invalid unicode character escape
  --> $DIR/literals-are-validated-before-expansion.rs:6:20
   |
LL |     black_hole! { '\u{FFFFFF}' }
   |                    ^^^^^^^^^^ invalid escape
   |
   = 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}" }
   |                                       ^^^^^^^^ invalid escape
   |
   = help: unicode escape must not be a surrogate

error: aborting due to 2 previous errors