checkpoint

Author: yaahc

library/alloc/src/boxed.rs

@@ -2365,3 +2365,21 @@ impl<'a> From<Cow<'a, str>> for Box<dyn Error> {
         From::from(String::from(err))
     }
 }
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "box_error", since = "1.8.0")]
+impl<T: core::error::Error> core::error::Error for Box<T> {
+    #[allow(deprecated, deprecated_in_future)]
+    fn description(&self) -> &str {
+        core::error::Error::description(&**self)
+    }
+
+    #[allow(deprecated)]
+    fn cause(&self) -> Option<&dyn core::error::Error> {
+        core::error::Error::cause(&**self)
+    }
+
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
+        core::error::Error::source(&**self)
+    }
+}

library/alloc/src/boxed/thin.rs

@@ -2,6 +2,8 @@
 // https://github.com/matthieu-m/rfc2580/blob/b58d1d3cba0d4b5e859d3617ea2d0943aaa31329/examples/thin.rs
 // by matthieu-m
 use crate::alloc::{self, Layout, LayoutError};
+#[cfg(not(bootstrap))]
+use core::error::Error;
 use core::fmt::{self, Debug, Display, Formatter};
 use core::marker::PhantomData;
 #[cfg(not(no_global_oom_handling))]
@@ -271,3 +273,11 @@ impl<H> WithHeader<H> {
         Layout::new::<H>().extend(value_layout)
     }
 }
+
+#[cfg(not(bootstrap))]
+#[unstable(feature = "thin_box", issue = "92791")]
+impl<T: ?Sized + Error> Error for ThinBox<T> {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        self.deref().source()
+    }
+}

library/alloc/src/collections/btree/map/entry.rs

@@ -133,6 +133,17 @@ impl<'a, K: Debug + Ord, V: Debug, A: Allocator + Clone> fmt::Display
     }
 }
 
+#[cfg(not(bootstrap))]
+#[unstable(feature = "map_try_insert", issue = "82766")]
+impl<'a, K: core::fmt::Debug + Ord, V: core::fmt::Debug> core::error::Error
+    for crate::collections::btree_map::OccupiedError<'a, K, V>
+{
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "key already exists"
+    }
+}
+
 impl<'a, K: Ord, V, A: Allocator + Clone> Entry<'a, K, V, A> {
     /// Ensures a value is in the entry by inserting the default if empty, and returns
     /// a mutable reference to the value in the entry.

library/alloc/src/lib.rs

@@ -111,6 +111,7 @@
 #![feature(const_pin)]
 #![feature(cstr_from_bytes_until_nul)]
 #![feature(dispatch_from_dyn)]
+#![cfg_attr(not(bootstrap), feature(error_generic_member_access))]
 #![cfg_attr(not(bootstrap), feature(error_in_core))]
 #![feature(exact_size_is_empty)]
 #![feature(extend_one)]
@@ -128,6 +129,7 @@
 #![feature(nonnull_slice_from_raw_parts)]
 #![feature(pattern)]
 #![feature(pointer_byte_offsets)]
+#![cfg_attr(not(bootstrap), feature(provide_any))]
 #![feature(ptr_internals)]
 #![feature(ptr_metadata)]
 #![feature(ptr_sub_ptr)]
@@ -240,3 +242,55 @@ pub mod vec;
 pub mod __export {
     pub use core::format_args;
 }
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "arc_error", since = "1.52.0")]
+impl<T: core::error::Error + ?Sized> core::error::Error for crate::sync::Arc<T> {
+    #[allow(deprecated, deprecated_in_future)]
+    fn description(&self) -> &str {
+        core::error::Error::description(&**self)
+    }
+
+    #[allow(deprecated)]
+    fn cause(&self) -> Option<&dyn core::error::Error> {
+        core::error::Error::cause(&**self)
+    }
+
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
+        core::error::Error::source(&**self)
+    }
+
+    fn provide<'a>(&'a self, req: &mut core::any::Demand<'a>) {
+        core::error::Error::provide(&**self, req);
+    }
+}
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "try_reserve", since = "1.57.0")]
+impl core::error::Error for crate::collections::TryReserveError {}
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl core::error::Error for crate::ffi::NulError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "nul byte found in data"
+    }
+}
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "cstring_from_vec_with_nul", since = "1.58.0")]
+impl core::error::Error for crate::ffi::FromVecWithNulError {}
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "cstring_into", since = "1.7.0")]
+impl core::error::Error for crate::ffi::IntoStringError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "C string contained non-utf8 bytes"
+    }
+
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
+        Some(self.__source())
+    }
+}

library/alloc/src/string.rs

@@ -44,6 +44,8 @@
 
 #[cfg(not(no_global_oom_handling))]
 use core::char::{decode_utf16, REPLACEMENT_CHARACTER};
+#[cfg(not(bootstrap))]
+use core::error::Error;
 use core::fmt;
 use core::hash;
 use core::iter::FusedIterator;
@@ -1938,6 +1940,24 @@ impl fmt::Display for FromUtf16Error {
     }
 }
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Error for FromUtf8Error {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "invalid utf-8"
+    }
+}
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Error for FromUtf16Error {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "invalid utf-16"
+    }
+}
+
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Clone for String {

library/core/src/alloc/layout.rs

@@ -5,6 +5,8 @@
 // Your performance intuition is useless. Run perf.
 
 use crate::cmp;
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 use crate::mem::{self, ValidAlign};
 use crate::ptr::NonNull;
@@ -436,6 +438,10 @@ pub type LayoutErr = LayoutError;
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub struct LayoutError;
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "alloc_layout", since = "1.28.0")]
+impl Error for LayoutError {}
+
 // (we need this for downstream impl of trait Error)
 #[stable(feature = "alloc_layout", since = "1.28.0")]
 impl fmt::Display for LayoutError {

library/core/src/alloc/mod.rs

@@ -21,6 +21,8 @@ pub use self::layout::LayoutErr;
 #[stable(feature = "alloc_layout_error", since = "1.50.0")]
 pub use self::layout::LayoutError;
 
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 use crate::ptr::{self, NonNull};
 
@@ -32,6 +34,14 @@ use crate::ptr::{self, NonNull};
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub struct AllocError;
 
+#[cfg(not(bootstrap))]
+#[unstable(
+    feature = "allocator_api",
+    reason = "the precise API and guarantees it provides may be tweaked.",
+    issue = "32838"
+)]
+impl Error for AllocError {}
+
 // (we need this for downstream impl of trait Error)
 #[unstable(feature = "allocator_api", issue = "32838")]
 impl fmt::Display for AllocError {

library/core/src/array/mod.rs

@@ -7,6 +7,8 @@
 use crate::borrow::{Borrow, BorrowMut};
 use crate::cmp::Ordering;
 use crate::convert::{Infallible, TryFrom};
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 use crate::hash::{self, Hash};
 use crate::iter::TrustedLen;
@@ -119,6 +121,15 @@ impl fmt::Display for TryFromSliceError {
     }
 }
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "try_from", since = "1.34.0")]
+impl Error for TryFromSliceError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}
+
 impl TryFromSliceError {
     #[unstable(
         feature = "array_error_internals",

library/core/src/char/decode.rs

@@ -1,5 +1,7 @@
 //! UTF-8 and UTF-16 decoding iterators
 
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 
 use super::from_u32_unchecked;
@@ -121,3 +123,12 @@ impl fmt::Display for DecodeUtf16Error {
         write!(f, "unpaired surrogate found: {:x}", self.code)
     }
 }
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "decode_utf16", since = "1.9.0")]
+impl Error for DecodeUtf16Error {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "unpaired surrogate found"
+    }
+}

library/core/src/char/mod.rs

@@ -36,6 +36,8 @@ pub use self::methods::encode_utf16_raw;
 #[unstable(feature = "char_internals", reason = "exposed only for libstd", issue = "none")]
 pub use self::methods::encode_utf8_raw;
 
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt::{self, Write};
 use crate::iter::FusedIterator;
 
@@ -582,3 +584,7 @@ impl fmt::Display for TryFromCharError {
         "unicode code point out of range".fmt(fmt)
     }
 }
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "u8_from_char", since = "1.59.0")]
+impl Error for TryFromCharError {}

library/core/src/convert/mod.rs

@@ -34,6 +34,8 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 use crate::hash::{Hash, Hasher};
 
@@ -715,6 +717,14 @@ impl fmt::Display for Infallible {
     }
 }
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "str_parse_error2", since = "1.8.0")]
+impl Error for Infallible {
+    fn description(&self) -> &str {
+        match *self {}
+    }
+}
+
 #[stable(feature = "convert_infallible", since = "1.34.0")]
 impl PartialEq for Infallible {
     fn eq(&self, _: &Infallible) -> bool {

library/core/src/error.rs

@@ -1,140 +1,6 @@
 //! Interfaces for working with Errors.
-//!
-//! # Error Handling In Rust
-//!
-//! The Rust language provides two complementary systems for constructing /
-//! representing, reporting, propagating, reacting to, and discarding errors.
-//! These responsibilities are collectively known as "error handling." The
-//! components of the first system, the panic runtime and interfaces, are most
-//! commonly used to represent bugs that have been detected in your program. The
-//! components of the second system, `Result`, the error traits, and user
-//! defined types, are used to represent anticipated runtime failure modes of
-//! your program.
-//!
-//! ## The Panic Interfaces
-//!
-//! The following are the primary interfaces of the panic system and the
-//! responsibilities they cover:
-//!
-//! * [`panic!`] and [`panic_any`] (Constructing, Propagated automatically)
-//! * [`PanicInfo`] (Reporting)
-//! * [`set_hook`], [`take_hook`], and [`#[panic_handler]`][panic-handler] (Reporting)
-//! * [`catch_unwind`] and [`resume_unwind`] (Discarding, Propagating)
-//!
-//! The following are the primary interfaces of the error system and the
-//! responsibilities they cover:
-//!
-//! * [`Result`] (Propagating, Reacting)
-//! * The [`Error`] trait (Reporting)
-//! * User defined types (Constructing / Representing)
-//! * [`match`] and [`downcast`] (Reacting)
-//! * The question mark operator ([`?`]) (Propagating)
-//! * The partially stable [`Try`] traits (Propagating, Constructing)
-//! * [`Termination`] (Reporting)
-//!
-//! ## Converting Errors into Panics
-//!
-//! The panic and error systems are not entirely distinct. Often times errors
-//! that are anticipated runtime failures in an API might instead represent bugs
-//! to a caller. For these situations the standard library provides APIs for
-//! constructing panics with an `Error` as it's source.
-//!
-//! * [`Result::unwrap`]
-//! * [`Result::expect`]
-//!
-//! These functions are equivalent, they either return the inner value if the
-//! `Result` is `Ok` or panic if the `Result` is `Err` printing the inner error
-//! as the source. The only difference between them is that with `expect` you
-//! provide a panic error message to be printed alongside the source, whereas
-//! `unwrap` has a default message indicating only that you unwraped an `Err`.
-//!
-//! Of the two, `expect` is generally preferred since its `msg` field allows you
-//! to convey your intent and assumptions which makes tracking down the source
-//! of a panic easier. `unwrap` on the other hand can still be a good fit in
-//! situations where you can trivially show that a piece of code will never
-//! panic, such as `"127.0.0.1".parse::<std::net::IpAddr>().unwrap()` or early
-//! prototyping.
-//!
-//! # Common Message Styles
-//!
-//! There are two common styles for how people word `expect` messages. Using
-//! the message to present information to users encountering a panic
-//! ("expect as error message") or using the message to present information
-//! to developers debugging the panic ("expect as precondition").
-//!
-//! In the former case the expect message is used to describe the error that
-//! has occurred which is considered a bug. Consider the following example:
-//!
-//! ```should_panic
-//! // Read environment variable, panic if it is not present
-//! let path = std::env::var("IMPORTANT_PATH").unwrap();
-//! ```
-//!
-//! In the "expect as error message" style we would use expect to describe
-//! that the environment variable was not set when it should have been:
-//!
-//! ```should_panic
-//! let path = std::env::var("IMPORTANT_PATH")
-//!     .expect("env variable `IMPORTANT_PATH` is not set");
-//! ```
-//!
-//! In the "expect as precondition" style, we would instead describe the
-//! reason we _expect_ the `Result` should be `Ok`. With this style we would
-//! prefer to write:
-//!
-//! ```should_panic
-//! let path = std::env::var("IMPORTANT_PATH")
-//!     .expect("env variable `IMPORTANT_PATH` should be set by `wrapper_script.sh`");
-//! ```
-//!
-//! The "expect as error message" style does not work as well with the
-//! default output of the std panic hooks, and often ends up repeating
-//! information that is already communicated by the source error being
-//! unwrapped:
-//!
-//! ```text
-//! thread 'main' panicked at 'env variable `IMPORTANT_PATH` is not set: NotPresent', src/main.rs:4:6
-//! ```
-//!
-//! In this example we end up mentioning that an env variable is not set,
-//! followed by our source message that says the env is not present, the
-//! only additional information we're communicating is the name of the
-//! environment variable being checked.
-//!
-//! The "expect as precondition" style instead focuses on source code
-//! readability, making it easier to understand what must have gone wrong in
-//! situations where panics are being used to represent bugs exclusively.
-//! Also, by framing our expect in terms of what "SHOULD" have happened to
-//! prevent the source error, we end up introducing new information that is
-//! independent from our source error.
-//!
-//! ```text
-//! thread 'main' panicked at 'env variable `IMPORTANT_PATH` should be set by `wrapper_script.sh`: NotPresent', src/main.rs:4:6
-//! ```
-//!
-//! In this example we are communicating not only the name of the
-//! environment variable that should have been set, but also an explanation
-//! for why it should have been set, and we let the source error display as
-//! a clear contradiction to our expectation.
-//!
-//! **Hint**: If you're having trouble remembering how to phrase
-//! expect-as-precondition style error messages remember to focus on the word
-//! "should" as in "env variable should be set by blah" or "the given binary
-//! should be available and executable by the current user".
-//!
-//! [`panic_any`]: crate::panic::panic_any
-//! [`PanicInfo`]: crate::panic::PanicInfo
-//! [`catch_unwind`]: crate::panic::catch_unwind
-//! [`resume_unwind`]: crate::panic::resume_unwind
-//! [`downcast`]: crate::error::Error
-//! [`Termination`]: crate::process::Termination
-//! [`Try`]: crate::ops::Try
-//! [panic hook]: crate::panic::set_hook
-//! [`set_hook`]: crate::panic::set_hook
-//! [`take_hook`]: crate::panic::take_hook
-//! [panic-handler]: <https://doc.rust-lang.org/nomicon/panic-handler.html>
-//! [`match`]: ../../std/keyword.match.html
-//! [`?`]: ../../std/result/index.html#the-question-mark-operator-
+// FIXME(yaahc): link to std docs or common docs and try to figure out intradoc issue
+#![unstable(feature = "error_in_core", issue = "none")]
 
 // A note about crates and the facade:
 //
@@ -563,3 +429,78 @@ impl<'a> Iterator for Chain<'a> {
         current
     }
 }
+
+#[stable(feature = "error_by_ref", since = "1.51.0")]
+impl<'a, T: Error + ?Sized> Error for &'a T {
+    #[allow(deprecated, deprecated_in_future)]
+    fn description(&self) -> &str {
+        Error::description(&**self)
+    }
+
+    #[allow(deprecated)]
+    fn cause(&self) -> Option<&dyn Error> {
+        Error::cause(&**self)
+    }
+
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        Error::source(&**self)
+    }
+
+    fn provide<'b>(&'b self, req: &mut Demand<'b>) {
+        Error::provide(&**self, req);
+    }
+}
+
+#[stable(feature = "fmt_error", since = "1.11.0")]
+impl Error for crate::fmt::Error {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "an error occurred when formatting an argument"
+    }
+}
+
+#[stable(feature = "try_borrow", since = "1.13.0")]
+impl Error for crate::cell::BorrowError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "already mutably borrowed"
+    }
+}
+
+#[stable(feature = "try_borrow", since = "1.13.0")]
+impl Error for crate::cell::BorrowMutError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "already borrowed"
+    }
+}
+
+#[stable(feature = "try_from", since = "1.34.0")]
+impl Error for crate::char::CharTryFromError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "converted integer out of range for `char`"
+    }
+}
+
+#[stable(feature = "char_from_str", since = "1.20.0")]
+impl Error for crate::char::ParseCharError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}
+
+#[unstable(feature = "duration_checked_float", issue = "83400")]
+impl Error for crate::time::FromFloatSecsError {}
+
+#[stable(feature = "frombyteswithnulerror_impls", since = "1.17.0")]
+impl Error for crate::ffi::FromBytesWithNulError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}
+
+#[unstable(feature = "cstr_from_bytes_until_nul", issue = "95027")]
+impl Error for crate::ffi::FromBytesUntilNulError {}

library/core/src/lib.rs

@@ -303,7 +303,6 @@ pub mod cmp;
 pub mod convert;
 pub mod default;
 #[cfg(not(bootstrap))]
-#[unstable(feature = "error_in_core", issue = "none")]
 pub mod error;
 pub mod marker;
 pub mod ops;

library/core/src/num/error.rs

@@ -1,6 +1,8 @@
 //! Error types for conversion to integral types.
 
 use crate::convert::Infallible;
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 
 /// The error type returned when a checked integral type conversion fails.
@@ -144,3 +146,21 @@ impl fmt::Display for ParseIntError {
         self.__description().fmt(f)
     }
 }
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Error for ParseIntError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "try_from", since = "1.34.0")]
+impl Error for TryFromIntError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}

library/core/src/num/mod.rs

@@ -3,6 +3,8 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use crate::ascii;
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::intrinsics;
 use crate::mem;
 use crate::ops::{Add, Mul, Sub};
@@ -57,6 +59,15 @@ pub use wrapping::Wrapping;
 #[cfg(not(no_fp_fmt_parse))]
 pub use dec2flt::ParseFloatError;
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Error for ParseFloatError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use error::ParseIntError;
 

library/core/src/str/error.rs

@@ -1,5 +1,7 @@
 //! Defines utf8 error type.
 
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt;
 
 /// Errors which can occur when attempting to interpret a sequence of [`u8`]
@@ -122,6 +124,15 @@ impl fmt::Display for Utf8Error {
     }
 }
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Error for Utf8Error {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "invalid utf-8: corrupt contents"
+    }
+}
+
 /// An error returned when parsing a `bool` using [`from_str`] fails
 ///
 /// [`from_str`]: super::FromStr::from_str
@@ -136,3 +147,12 @@ impl fmt::Display for ParseBoolError {
         "provided string was not `true` or `false`".fmt(f)
     }
 }
+
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Error for ParseBoolError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "failed to parse bool"
+    }
+}

library/std/src/collections/hash/map.rs

@@ -9,6 +9,8 @@ use crate::borrow::Borrow;
 use crate::cell::Cell;
 use crate::collections::TryReserveError;
 use crate::collections::TryReserveErrorKind;
+#[cfg(not(bootstrap))]
+use crate::error::Error;
 use crate::fmt::{self, Debug};
 #[allow(deprecated)]
 use crate::hash::{BuildHasher, Hash, Hasher, SipHasher13};
@@ -2158,6 +2160,15 @@ impl<'a, K: Debug, V: Debug> fmt::Display for OccupiedError<'a, K, V> {
     }
 }
 
+#[cfg(not(bootstrap))]
+#[unstable(feature = "map_try_insert", issue = "82766")]
+impl<'a, K: fmt::Debug, V: fmt::Debug> Error for OccupiedError<'a, K, V> {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "key already exists"
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, K, V, S> IntoIterator for &'a HashMap<K, V, S> {
     type Item = (&'a K, &'a V);

library/std/src/error.rs

@@ -76,6 +76,15 @@ impl fmt::Debug for Error {
     }
 }
 
+#[cfg(not(bootstrap))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl From<alloc::ffi::NulError> for Error {
+    /// Converts a [`alloc::ffi::NulError`] into a [`io::Error`].
+    fn from(_: alloc::ffi::NulError) -> Error {
+        const_io_error!(ErrorKind::InvalidInput, "data provided contains a nul byte")
+    }
+}
+
 // Only derive debug in tests, to make sure it
 // doesn't accidentally get printed.
 #[cfg_attr(test, derive(Debug))]

library/std/src/io/error.rs

@@ -271,6 +271,7 @@
 #![feature(duration_constants)]
 #![cfg_attr(not(bootstrap), feature(error_generic_member_access))]
 #![cfg_attr(not(bootstrap), feature(error_in_core))]
+#![cfg_attr(not(bootstrap), feature(error_iter))]
 #![feature(exact_size_is_empty)]
 #![feature(exclusive_wrapper)]
 #![feature(extend_one)]