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thiserror/tests/test_display.rs
David Tolnay 9f27b766f5
Ignore elidable_lifetime_names pedantic clippy lint 
warning: the following explicit lifetimes could be elided: 'a
     --> src/var.rs:5:6
      |
    5 | impl<'a, T: Pointer + ?Sized> Pointer for Var<'a, T> {
      |      ^^                                       ^^
      |
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#elidable_lifetime_names
      = note: `-W clippy::elidable-lifetime-names` implied by `-W clippy::pedantic`
      = help: to override `-W clippy::pedantic` add `#[allow(clippy::elidable_lifetime_names)]`
    help: elide the lifetimes
      |
    5 - impl<'a, T: Pointer + ?Sized> Pointer for Var<'a, T> {
    5 + impl<T: Pointer + ?Sized> Pointer for Var<'_, T> {
      |

    warning: the following explicit lifetimes could be elided: 'a
      --> tests/test_lints.rs:40:22
       |
    40 |     pub enum MyError<'a> {
       |                      ^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#elidable_lifetime_names
       = note: `-W clippy::elidable-lifetime-names` implied by `-W clippy::pedantic`
       = help: to override `-W clippy::pedantic` add `#[allow(clippy::elidable_lifetime_names)]`
    help: elide the lifetimes
       |
    40 -     pub enum MyError<'a> {
    40 +     pub enum MyError'_> {
       |

    warning: the following explicit lifetimes could be elided: 'a
       --> tests/test_display.rs:157:14
        |
    157 |         impl<'a> Display for Msg<'a> {
        |              ^^                  ^^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#elidable_lifetime_names
        = note: `-W clippy::elidable-lifetime-names` implied by `-W clippy::pedantic`
        = help: to override `-W clippy::pedantic` add `#[allow(clippy::elidable_lifetime_names)]`
    help: elide the lifetimes
        |
    157 -         impl<'a> Display for Msg<'a> {
    157 +         impl Display for Msg<'_> {
        |
2025-03-02 19:56:43 -08:00

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#![allow(
clippy::elidable_lifetime_names,
clippy::needless_lifetimes,
clippy::needless_raw_string_hashes,
clippy::trivially_copy_pass_by_ref,
clippy::uninlined_format_args
)]
use core::fmt::{self, Display};
use thiserror::Error;
fn assert<T: Display>(expected: &str, value: T) {
assert_eq!(expected, value.to_string());
}
#[test]
fn test_braced() {
#[derive(Error, Debug)]
#[error("braced error: {msg}")]
struct Error {
msg: String,
}
let msg = "T".to_owned();
assert("braced error: T", Error { msg });
}
#[test]
fn test_braced_unused() {
#[derive(Error, Debug)]
#[error("braced error")]
struct Error {
extra: usize,
}
assert("braced error", Error { extra: 0 });
}
#[test]
fn test_tuple() {
#[derive(Error, Debug)]
#[error("tuple error: {0}")]
struct Error(usize);
assert("tuple error: 0", Error(0));
}
#[test]
fn test_unit() {
#[derive(Error, Debug)]
#[error("unit error")]
struct Error;
assert("unit error", Error);
}
#[test]
fn test_enum() {
#[derive(Error, Debug)]
enum Error {
#[error("braced error: {id}")]
Braced { id: usize },
#[error("tuple error: {0}")]
Tuple(usize),
#[error("unit error")]
Unit,
}
assert("braced error: 0", Error::Braced { id: 0 });
assert("tuple error: 0", Error::Tuple(0));
assert("unit error", Error::Unit);
}
#[test]
fn test_constants() {
#[derive(Error, Debug)]
#[error("{MSG}: {id:?} (code {CODE:?})")]
struct Error {
id: &'static str,
}
const MSG: &str = "failed to do";
const CODE: usize = 9;
assert("failed to do: \"\" (code 9)", Error { id: "" });
}
#[test]
fn test_inherit() {
#[derive(Error, Debug)]
#[error("{0}")]
enum Error {
Some(&'static str),
#[error("other error")]
Other(&'static str),
}
assert("some error", Error::Some("some error"));
assert("other error", Error::Other("..."));
}
#[test]
fn test_brace_escape() {
#[derive(Error, Debug)]
#[error("fn main() {{}}")]
struct Error;
assert("fn main() {}", Error);
}
#[test]
fn test_expr() {
#[derive(Error, Debug)]
#[error("1 + 1 = {}", 1 + 1)]
struct Error;
assert("1 + 1 = 2", Error);
}
#[test]
fn test_nested() {
#[derive(Error, Debug)]
#[error("!bool = {}", not(.0))]
struct Error(bool);
#[allow(clippy::trivially_copy_pass_by_ref)]
fn not(bool: &bool) -> bool {
!*bool
}
assert("!bool = false", Error(true));
}
#[test]
fn test_match() {
#[derive(Error, Debug)]
#[error("{intro}: {0}", intro = match .1 {
Some(n) => format!("error occurred with {}", n),
None => "there was an empty error".to_owned(),
})]
struct Error(String, Option<usize>);
assert(
"error occurred with 1: ...",
Error("...".to_owned(), Some(1)),
);
assert(
"there was an empty error: ...",
Error("...".to_owned(), None),
);
}
#[test]
fn test_nested_display() {
// Same behavior as the one in `test_match`, but without String allocations.
#[derive(Error, Debug)]
#[error("{}", {
struct Msg<'a>(&'a String, &'a Option<usize>);
impl<'a> Display for Msg<'a> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
match self.1 {
Some(n) => write!(formatter, "error occurred with {}", n),
None => write!(formatter, "there was an empty error"),
}?;
write!(formatter, ": {}", self.0)
}
}
Msg(.0, .1)
})]
struct Error(String, Option<usize>);
assert(
"error occurred with 1: ...",
Error("...".to_owned(), Some(1)),
);
assert(
"there was an empty error: ...",
Error("...".to_owned(), None),
);
}
#[test]
fn test_void() {
#[allow(clippy::empty_enum)]
#[derive(Error, Debug)]
#[error("...")]
pub enum Error {}
let _: Error;
}
#[test]
fn test_mixed() {
#[derive(Error, Debug)]
#[error("a={a} :: b={} :: c={c} :: d={d}", 1, c = 2, d = 3)]
struct Error {
a: usize,
d: usize,
}
assert("a=0 :: b=1 :: c=2 :: d=3", Error { a: 0, d: 0 });
}
#[test]
fn test_ints() {
#[derive(Error, Debug)]
enum Error {
#[error("error {0}")]
Tuple(usize, usize),
#[error("error {0}", '?')]
Struct { v: usize },
}
assert("error 9", Error::Tuple(9, 0));
assert("error ?", Error::Struct { v: 0 });
}
#[test]
fn test_trailing_comma() {
#[derive(Error, Debug)]
#[error(
"error {0}",
)]
#[rustfmt::skip]
struct Error(char);
assert("error ?", Error('?'));
}
#[test]
fn test_field() {
#[derive(Debug)]
struct Inner {
data: usize,
}
#[derive(Error, Debug)]
#[error("{}", .0.data)]
struct Error(Inner);
assert("0", Error(Inner { data: 0 }));
}
#[test]
fn test_nested_tuple_field() {
#[derive(Debug)]
struct Inner(usize);
#[derive(Error, Debug)]
#[error("{}", .0.0)]
struct Error(Inner);
assert("0", Error(Inner(0)));
}
#[test]
fn test_pointer() {
#[derive(Error, Debug)]
#[error("{field:p}")]
pub struct Struct {
field: Box<i32>,
}
let s = Struct {
field: Box::new(-1),
};
assert_eq!(s.to_string(), format!("{:p}", s.field));
}
#[test]
fn test_macro_rules_variant_from_call_site() {
// Regression test for https://github.com/dtolnay/thiserror/issues/86
macro_rules! decl_error {
($variant:ident($value:ident)) => {
#[derive(Error, Debug)]
pub enum Error0 {
#[error("{0:?}")]
$variant($value),
}
#[derive(Error, Debug)]
#[error("{0:?}")]
pub enum Error1 {
$variant($value),
}
};
}
decl_error!(Repro(u8));
assert("0", Error0::Repro(0));
assert("0", Error1::Repro(0));
}
#[test]
fn test_macro_rules_message_from_call_site() {
// Regression test for https://github.com/dtolnay/thiserror/issues/398
macro_rules! decl_error {
($($errors:tt)*) => {
#[derive(Error, Debug)]
pub enum Error {
$($errors)*
}
};
}
decl_error! {
#[error("{0}")]
Unnamed(u8),
#[error("{x}")]
Named { x: u8 },
}
assert("0", Error::Unnamed(0));
assert("0", Error::Named { x: 0 });
}
#[test]
fn test_raw() {
#[derive(Error, Debug)]
#[error("braced raw error: {fn}")]
struct Error {
r#fn: &'static str,
}
assert("braced raw error: T", Error { r#fn: "T" });
}
#[test]
fn test_raw_enum() {
#[derive(Error, Debug)]
enum Error {
#[error("braced raw error: {fn}")]
Braced { r#fn: &'static str },
}
assert("braced raw error: T", Error::Braced { r#fn: "T" });
}
#[test]
fn test_keyword() {
#[derive(Error, Debug)]
#[error("error: {type}", type = 1)]
struct Error;
assert("error: 1", Error);
}
#[test]
fn test_self() {
#[derive(Error, Debug)]
#[error("error: {self:?}")]
struct Error;
assert("error: Error", Error);
}
#[test]
fn test_str_special_chars() {
#[derive(Error, Debug)]
pub enum Error {
#[error("brace left {{")]
BraceLeft,
#[error("brace left 2 \x7B\x7B")]
BraceLeft2,
#[error("brace left 3 \u{7B}\u{7B}")]
BraceLeft3,
#[error("brace right }}")]
BraceRight,
#[error("brace right 2 \x7D\x7D")]
BraceRight2,
#[error("brace right 3 \u{7D}\u{7D}")]
BraceRight3,
#[error(
"new_\
line"
)]
NewLine,
#[error("escape24 \u{78}")]
Escape24,
}
assert("brace left {", Error::BraceLeft);
assert("brace left 2 {", Error::BraceLeft2);
assert("brace left 3 {", Error::BraceLeft3);
assert("brace right }", Error::BraceRight);
assert("brace right 2 }", Error::BraceRight2);
assert("brace right 3 }", Error::BraceRight3);
assert("new_line", Error::NewLine);
assert("escape24 x", Error::Escape24);
}
#[test]
fn test_raw_str() {
#[derive(Error, Debug)]
pub enum Error {
#[error(r#"raw brace left {{"#)]
BraceLeft,
#[error(r#"raw brace left 2 \x7B"#)]
BraceLeft2,
#[error(r#"raw brace right }}"#)]
BraceRight,
#[error(r#"raw brace right 2 \x7D"#)]
BraceRight2,
}
assert(r#"raw brace left {"#, Error::BraceLeft);
assert(r#"raw brace left 2 \x7B"#, Error::BraceLeft2);
assert(r#"raw brace right }"#, Error::BraceRight);
assert(r#"raw brace right 2 \x7D"#, Error::BraceRight2);
}
mod util {
use core::fmt::{self, Octal};
pub fn octal<T: Octal>(value: &T, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "0o{:o}", value)
}
}
#[test]
fn test_fmt_path() {
fn unit(formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("unit=")
}
fn pair(k: &i32, v: &i32, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "pair={k}:{v}")
}
#[derive(Error, Debug)]
pub enum Error {
#[error(fmt = unit)]
Unit,
#[error(fmt = pair)]
Tuple(i32, i32),
#[error(fmt = pair)]
Entry { k: i32, v: i32 },
#[error(fmt = crate::util::octal)]
I16(i16),
#[error(fmt = crate::util::octal::<i32>)]
I32 { n: i32 },
#[error(fmt = core::fmt::Octal::fmt)]
I64(i64),
#[error("...{0}")]
Other(bool),
}
assert("unit=", Error::Unit);
assert("pair=10:0", Error::Tuple(10, 0));
assert("pair=10:0", Error::Entry { k: 10, v: 0 });
assert("0o777", Error::I16(0o777));
assert("0o777", Error::I32 { n: 0o777 });
assert("777", Error::I64(0o777));
assert("...false", Error::Other(false));
}
#[test]
fn test_fmt_path_inherited() {
#[derive(Error, Debug)]
#[error(fmt = crate::util::octal)]
pub enum Error {
I16(i16),
I32 {
n: i32,
},
#[error(fmt = core::fmt::Octal::fmt)]
I64(i64),
#[error("...{0}")]
Other(bool),
}
assert("0o777", Error::I16(0o777));
assert("0o777", Error::I32 { n: 0o777 });
assert("777", Error::I64(0o777));
assert("...false", Error::Other(false));
}
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