| error: format argument must be a string literal | |
| --> $DIR/derive-in-eager-expansion-hang.rs:4:5 | |
| | | |
| LL | / { | |
| LL | | #[derive(Clone)] | |
| LL | | struct S; | |
| LL | | | |
| LL | | "" | |
| LL | | } | |
| | |_____^ | |
| ... | |
| LL | format_args!(hang!()); | |
| | ------- in this macro invocation | |
| | | |
| help: you might be missing a string literal to format with | |
| | | |
| LL | format_args!("{}", hang!()); | |
| | ^^^^^ | |
| error: aborting due to previous error | |