Derive Debug for types where not all fields implement Debug.
This crate works on stable and with no_std.
On nightly the unstable feature can be used for specialization based trait detection and/or .. formatting.
use partialdebug::placeholder::PartialDebug;
#[derive(PartialDebug)]
struct Dog {
legs: usize,
eyes: usize,
dna: DNA,
}
assert_eq!(format!("{:?}", Dog::new()), "Dog { legs: 4, eyes: 2, dna: DNA }");use partialdebug::placeholder::PartialDebug;
#[derive(PartialDebug)]
#[debug_placeholder = "Unknown"]
struct Dog {
legs: usize,
eyes: usize,
dna: DNA,
}
assert_eq!(format!("{:?}", Dog::new()), "Dog { legs: 4, eyes: 2, dna: Unknown }");Only available on nightly after setting the unstable feature.
Requires the debug_non_exhaustive feature to be enabled in user code.
Only available for structs with named fields.
#![feature(debug_non_exhaustive)]
use partialdebug::non_exhaustive::PartialDebug;
#[derive(PartialDebug)]
struct Dog {
legs: usize,
eyes: usize,
dna: DNA,
}
assert_eq!(format!("{:?}", Dog::new()), "Dog { legs: 4, eyes: 2, .. }");Trait detection for generic types requires specialization.
To enable specialization based trait detection use a nightly compiler and enable the unstable feature.
use partialdebug::placeholder::PartialDebug;
#[derive(PartialDebug)]
struct Container<T>(T);
#[cfg(feature = "unstable")]
assert_eq!(format!("{:?}", Container(42)), "Container(42)");
#[cfg(not(feature = "unstable"))]
assert_eq!(format!("{:?}", Container(42)), "Container(T)");Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.