error: invalid format string: expected `'}'` but string was terminated --> $DIR/closing-brace-as-fill.rs:6:35 | LL | println!("Hello, world! {0:}<3", 2); | - ^ expected `'}'` in format string | | | this is not interpreted as a formatting closing brace | = note: the character `'}'` is interpreted as a fill character because of the `:` that precedes it error: aborting due to previous error