error[E0382]: use of moved value: `s`
  --> $DIR/issue-29723.rs:22:13
   |
LL |         0 if { drop(s); false } => String::from("oops"),
   |                     - value moved here
...
LL |             s
   |             ^ value used here after move
   |
   = note: move occurs because `s` has type `std::string::String`, which does not implement the `Copy` trait

error: aborting due to previous error

For more information about this error, try `rustc --explain E0382`.