structopt 0.3.22

Parse command line argument by defining a struct.
Documentation 
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error[E0277]: the trait bound `Kind: Default` is not satisfied
  --> $DIR/skip_without_default.rs:22:17
   |
22 |     #[structopt(skip)]
   |                 ^^^^ the trait `Default` is not implemented for `Kind`
   |
   = note: required by `std::default::Default::default`