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