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Better Debug impl for io::Error.

This commit is contained in:
Clar Charr 2018-01-01 21:56:22 -05:00
parent b65f0bedd2
commit 52e074e40e
1 changed files with 35 additions and 8 deletions
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43
src/libstd/io/error.rs
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@ -62,12 +62,18 @@ pub type Result<T> = result::Result<T, Error>;
/// [`Write`]: ../io/trait.Write.html
/// [`Seek`]: ../io/trait.Seek.html
/// [`ErrorKind`]: enum.ErrorKind.html
#[derive(Debug)]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct Error {
repr: Repr,
}
#[stable(feature = "rust1", since = "1.0.0")]
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(&self.repr, f)
}
}
enum Repr {
Os(i32),
Simple(ErrorKind),
@ -511,10 +517,12 @@ impl Error {
impl fmt::Debug for Repr {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
Repr::Os(ref code) =>
fmt.debug_struct("Os").field("code", code)
.field("message", &sys::os::error_string(*code)).finish(),
Repr::Custom(ref c) => fmt.debug_tuple("Custom").field(c).finish(),
Repr::Os(code) =>
fmt.debug_struct("Os")
.field("code", &code)
.field("kind", &sys::decode_error_kind(code))
.field("message", &sys::os::error_string(code)).finish(),
Repr::Custom(ref c) => fmt::Debug::fmt(&c, fmt),
Repr::Simple(kind) => fmt.debug_tuple("Kind").field(&kind).finish(),
}
}
@ -559,17 +567,36 @@ fn _assert_error_is_sync_send() {
#[cfg(test)]
mod test {
use super::{Error, ErrorKind};
use super::{Error, ErrorKind, Repr, Custom};
use error;
use fmt;
use sys::os::error_string;
use sys::decode_error_kind;
#[test]
fn test_debug_error() {
let code = 6;
let msg = error_string(code);
let err = Error { repr: super::Repr::Os(code) };
let expected = format!("Error {{ repr: Os {{ code: {:?}, message: {:?} }} }}", code, msg);
let kind = decode_error_kind(code);
let err = Error {
repr: Repr::Custom(box Custom {
kind: ErrorKind::InvalidInput,
error: box Error {
repr: super::Repr::Os(code)
},
})
};
let expected = format!(
"Custom {{ \
kind: InvalidInput, \
error: Os {{ \
code: {:?}, \
kind: {:?}, \
message: {:?} \
}} \
}}",
code, kind, msg
);
assert_eq!(format!("{:?}", err), expected);
}