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extern crate failure;
#[macro_use]
extern crate failure_derive;
#[derive(Fail, Debug)]
#[fail(display = "An error has occurred.")]
struct UnitError;
#[test]
fn unit_struct() {
let s = format!("{}", UnitError);
assert_eq!(&s[..], "An error has occurred.");
}
#[derive(Fail, Debug)]
#[fail(display = "Error code: {}", code)]
struct RecordError {
code: u32,
}
#[test]
fn record_struct() {
let s = format!("{}", RecordError { code: 0 });
assert_eq!(&s[..], "Error code: 0");
}
#[derive(Fail, Debug)]
#[fail(display = "Error code: {}", _0)]
struct TupleError(i32);
#[test]
fn tuple_struct() {
let s = format!("{}", TupleError(2));
assert_eq!(&s[..], "Error code: 2");
}
#[derive(Fail, Debug)]
enum EnumError {
#[fail(display = "Error code: {}", code)]
StructVariant { code: i32 },
#[fail(display = "Error: {}", _0)]
TupleVariant(&'static str),
#[fail(display = "An error has occurred.")]
UnitVariant,
}
#[test]
fn enum_error() {
let s = format!("{}", EnumError::StructVariant { code: 2 });
assert_eq!(&s[..], "Error code: 2");
let s = format!("{}", EnumError::TupleVariant("foobar"));
assert_eq!(&s[..], "Error: foobar");
let s = format!("{}", EnumError::UnitVariant);
assert_eq!(&s[..], "An error has occurred.");
}
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