I can't wait to see how people use default field values in #Rust!
It felt like an eternity to land this (specially if we count the years of discussion before the, I believe, 3rd RFC was accepted), but as of next nightly you will be able to write

struct Foo {
bar: Type = Type::const_method(),
}

Foo { .. } // implicit `bar: Type::const_method()` call

The main difference between github.com/rust-lang/rust/pull… and derive(Default) is that the latter doesn't support having mandatory fields.
#RustLang