For structs with named fields generates an impl that would return a doc comment for a field, if one is available:
#[derive(Debug, Comgrabe)]
/// outer
#[allow(dead_code)]
struct Foo<'a, T> {
/// Bar
/// Bar2
x: bool,
/// B
b: &'a str,
/// t
ttt: T,
}
assert_eq!(Some("Bar\nBar2"), Foo::<()>::comgrabe("x"));
assert_eq!(Some("t"), Foo::<()>::comgrabe("ttt"));
assert_eq!(None, Foo::<()>::comgrabe("nosuch"));