blob: 57a0fc1626a480303b5b3a27375757eb0d4f0389 [file] [log] [blame]
use std::fmt::Display;
use thiserror::Error;
#[derive(Error, Debug)]
#[error("braced error: {msg}")]
struct BracedError {
msg: String,
}
#[derive(Error, Debug)]
#[error("braced error")]
struct BracedUnused {
extra: usize,
}
#[derive(Error, Debug)]
#[error("tuple error: {0}")]
struct TupleError(usize);
#[derive(Error, Debug)]
#[error("unit error")]
struct UnitError;
#[derive(Error, Debug)]
enum EnumError {
#[error("braced error: {id}")]
Braced { id: usize },
#[error("tuple error: {0}")]
Tuple(usize),
#[error("unit error")]
Unit,
}
#[derive(Error, Debug)]
#[error("{0}")]
enum Inherit {
Unit(UnitError),
#[error("other error")]
Other(UnitError),
}
#[derive(Error, Debug)]
#[error("1 + 1 = {}", 1 + 1)]
struct Arithmetic;
#[derive(Error, Debug)]
#[error("!bool = {}", not(.0))]
struct NestedShorthand(bool);
#[derive(Error, Debug)]
#[error("...")]
pub enum Void {}
fn not(bool: &bool) -> bool {
!*bool
}
fn assert<T: Display>(expected: &str, value: T) {
assert_eq!(expected, value.to_string());
}
#[test]
fn test_display() {
let msg = "T".to_owned();
assert("braced error: T", BracedError { msg });
assert("braced error", BracedUnused { extra: 0 });
assert("tuple error: 0", TupleError(0));
assert("unit error", UnitError);
assert("braced error: 0", EnumError::Braced { id: 0 });
assert("tuple error: 0", EnumError::Tuple(0));
assert("unit error", EnumError::Unit);
assert("unit error", Inherit::Unit(UnitError));
assert("other error", Inherit::Other(UnitError));
assert("1 + 1 = 2", Arithmetic);
assert("!bool = false", NestedShorthand(true));
}