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#![deny(clippy::all, clippy::pedantic)]
use std::fmt::{self, Debug, Display};
use thiserror::Error;
pub struct NoFormat;
#[derive(Debug)]
pub struct DebugOnly;
pub struct DisplayOnly;
impl Display for DisplayOnly {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("display only")
}
}
#[derive(Debug)]
pub struct DebugAndDisplay;
impl Display for DebugAndDisplay {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("debug and display")
}
}
// Should expand to:
//
// impl<E> Display for EnumDebugField<E>
// where
// E: Debug;
//
// impl<E> Error for EnumDebugField<E>
// where
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum EnumDebugGeneric<E> {
#[error("{0:?}")]
FatalError(E),
}
// Should expand to:
//
// impl<E> Display for EnumFromGeneric<E>;
//
// impl<E> Error for EnumFromGeneric<E>
// where
// EnumDebugGeneric<E>: Error + 'static,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum EnumFromGeneric<E> {
#[error("enum from generic")]
Source(#[from] EnumDebugGeneric<E>),
}
// Should expand to:
//
// impl<HasDisplay, HasDebug, HasNeither> Display
// for EnumCompound<HasDisplay, HasDebug, HasNeither>
// where
// HasDisplay: Display,
// HasDebug: Debug;
//
// impl<HasDisplay, HasDebug, HasNeither> Error
// for EnumCompound<HasDisplay, HasDebug, HasNeither>
// where
// Self: Debug + Display;
//
#[derive(Error)]
pub enum EnumCompound<HasDisplay, HasDebug, HasNeither> {
#[error("{0} {1:?}")]
DisplayDebug(HasDisplay, HasDebug),
#[error("{0}")]
Display(HasDisplay, HasNeither),
#[error("{1:?}")]
Debug(HasNeither, HasDebug),
}
impl<HasDisplay, HasDebug, HasNeither> Debug for EnumCompound<HasDisplay, HasDebug, HasNeither> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("EnumCompound")
}
}
#[test]
fn test_display_enum_compound() {
let mut instance: EnumCompound<DisplayOnly, DebugOnly, NoFormat>;
instance = EnumCompound::DisplayDebug(DisplayOnly, DebugOnly);
assert_eq!(format!("{}", instance), "display only DebugOnly");
instance = EnumCompound::Display(DisplayOnly, NoFormat);
assert_eq!(format!("{}", instance), "display only");
instance = EnumCompound::Debug(NoFormat, DebugOnly);
assert_eq!(format!("{}", instance), "DebugOnly");
}
// Should expand to:
//
// impl<E> Display for EnumTransparentGeneric<E>
// where
// E: Display;
//
// impl<E> Error for EnumTransparentGeneric<E>
// where
// E: Error,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub enum EnumTransparentGeneric<E> {
#[error(transparent)]
Other(E),
}
// Should expand to:
//
// impl<E> Display for StructDebugGeneric<E>
// where
// E: Debug;
//
// impl<E> Error for StructDebugGeneric<E>
// where
// Self: Debug + Display;
//
#[derive(Error, Debug)]
#[error("{underlying:?}")]
pub struct StructDebugGeneric<E> {
pub underlying: E,
}
// Should expand to:
//
// impl<E> Error for StructFromGeneric<E>
// where
// StructDebugGeneric<E>: Error + 'static,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
pub struct StructFromGeneric<E> {
#[from]
pub source: StructDebugGeneric<E>,
}
// Should expand to:
//
// impl<E> Display for StructTransparentGeneric<E>
// where
// E: Display;
//
// impl<E> Error for StructTransparentGeneric<E>
// where
// E: Error,
// Self: Debug + Display;
//
#[derive(Error, Debug)]
#[error(transparent)]
pub struct StructTransparentGeneric<E>(E);
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