error: invalid format string: expected `}` but string was terminated
  --> $DIR/respanned-literal-issue-106191.rs:6:65
   |
LL |     format_string_proc_macro::respan_to_invalid_format_literal!("¡");
   |                                                                 ^^^ expected `}` in format string
   |
   = note: if you intended to print `{`, you can escape it using `{{`

error: invalid format string: expected `}` but string was terminated
  --> $DIR/respanned-literal-issue-106191.rs:8:18
   |
LL |     format_args!(r#concat!("¡        {"));
   |                  ^^^^^^^^^^^^^^^^^^^^^^^ expected `}` in format string
   |
   = note: if you intended to print `{`, you can escape it using `{{`
   = note: this error originates in the macro `concat` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors