Example of the generated code by rustc 1.49 for a couple struct and enums:
#![feature(prelude_import)]
#![no_std]
#[prelude_import]
use ::std::prelude::v1::*;
#[macro_use]
extern crate std;
struct Foo {
    a: i32,
    b: i64,
}
#[automatically_derived]
#[allow(unused_qualifications)]
impl ::core::fmt::Debug for Foo {
    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
        match *self {
            Foo { a: ref __self_0_0, b: ref __self_0_1 } => {
                let mut debug_trait_builder = f.debug_struct("Foo");
                let _ = debug_trait_builder.field("a", &&(*__self_0_0));
                let _ = debug_trait_builder.field("b", &&(*__self_0_1));
                debug_trait_builder.finish()
            }
        }
    }
}

struct FooF(String, i32);
#[automatically_derived]
#[allow(unused_qualifications)]
impl ::core::fmt::Debug for FooF {
    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
        match *self {
            FooF(ref __self_0_0, ref __self_0_1) => {
                let mut debug_trait_builder = f.debug_tuple("FooF");
                let _ = debug_trait_builder.field(&&(*__self_0_0));
                let _ = debug_trait_builder.field(&&(*__self_0_1));
                debug_trait_builder.finish()
            }
        }
    }
}

enum Bar {
    A,
    B(i32),
    C {
        a: i32,
    },
}
#[automatically_derived]
#[allow(unused_qualifications)]
impl ::core::fmt::Debug for Bar {
    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
        match (&*self,) {
            (&Bar::A,) => {
                let mut debug_trait_builder = f.debug_tuple("A");
                debug_trait_builder.finish()
            }
            (&Bar::B(ref __self_0),) => {
                let mut debug_trait_builder = f.debug_tuple("B");
                let _ = debug_trait_builder.field(&&(*__self_0));
                debug_trait_builder.finish()
            }
            (&Bar::C { a: ref __self_0 },) => {
                let mut debug_trait_builder = f.debug_struct("C");
                let _ = debug_trait_builder.field("a", &&(*__self_0));
                debug_trait_builder.finish()
            }
        }
    }
}

union BarF {
    a: u64,
    b: String,
}

fn main() { }
Debug #2994

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