error: 1 positional argument in format string, but no arguments were given
  --> $DIR/issue-81006.rs:6:23
   |
LL |     let _ = format!("→{}→\n");
   |                       ^^

error: 1 positional argument in format string, but no arguments were given
  --> $DIR/issue-81006.rs:8:23
   |
LL |     let _ = format!("→{} \n");
   |                       ^^

error: aborting due to 2 previous errors