structopt 0.3.4

Parse command line argument by defining a struct.
Documentation 
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error: `#[structopt(raw(...))` attributes are removed in structopt 0.3, they are replaced with raw methods
help: if you meant to call `clap::Arg::raw()` method you should use bool literal, like `raw(true)` or `raw(false)`
  --> $DIR/raw.rs:13:17
   |
13 |     #[structopt(raw(case_insensitive = "true"))]
   |                 ^^^