parse-display 0.11.0

Procedural macro to implement Display and FromStr using common settings.
Documentation 
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use parse_display::FromStr;

#[derive(FromStr)]
#[display("{a}")]
#[from_str(default_fields(b))]
struct X {
    a: u8,
    b: u8,
}

compile_error!("force trybuild to compare warnings");

fn main() {}