LL | #[derive(A)]
| ^ expected `:`
|
- = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
+ = note: this error originates in the derive macro `A` (in Nightly builds, run with -Z macro-backtrace for more info)
error: proc-macro derive produced unparseable tokens
--> $DIR/derive-bad.rs:6:10