+error: only a `panic!` in `if`-then statement
+ --> $DIR/manual_assert.rs:65:5
+ |
+LL | / if a.is_empty() {
+LL | | panic!("with expansion {}", one!())
+LL | | }
+ | |_____^ help: try: `assert!(!a.is_empty(), "with expansion {}", one!());`
+
+error: aborting due to 8 previous errors