I agree it seems like a lot of boilerplate, but from what little I've played around with Rust, it seems they've already adopted strategies similar to this for instantiating objects with the builder pattern[1], but the nuts and bolts are abstracted away so the interface is slightly different.

If I understand it correctly, the equivalent builder pattern in Rust (which is essentially using methods to build a struct used to instantiate the object) would be:

    let search = Search::new("foo","f")
      .option_case_sensitive(true)
      .option_from_end(false)
      .build();

Where "new" returns a builder object/struct with passed in and default params, those options methods are optional and can change those defaults, and the build method actually builders the search object from the search builder struct with all the params.

I'm not sure how well this style works with simple functions, unless there's a macro or crate that can do most of this work for you from a a spec.

1: https://doc.rust-lang.org/1.0.0/style/ownership/builders.htm...