Stabilize the TryFrom and TryInto traits
Tracking issue: https://github.com/rust-lang/rust/issues/33417
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@ -59,7 +59,7 @@ unsafe impl<T, A: Unsize<[T]>> FixedSizeArray<T> for A {
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}
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/// The error type returned when a conversion from a slice to an array fails.
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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#[derive(Debug, Copy, Clone)]
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pub struct TryFromSliceError(());
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@ -148,7 +148,7 @@ macro_rules! array_impls {
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl<'a, T> TryFrom<&'a [T]> for &'a [T; $N] {
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type Error = TryFromSliceError;
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@ -162,7 +162,7 @@ macro_rules! array_impls {
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl<'a, T> TryFrom<&'a mut [T]> for &'a mut [T; $N] {
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type Error = TryFromSliceError;
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@ -265,7 +265,7 @@ impl FromStr for char {
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl TryFrom<u32> for char {
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type Error = CharTryFromError;
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@ -280,11 +280,11 @@ impl TryFrom<u32> for char {
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}
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/// The error type returned when a conversion from u32 to char fails.
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct CharTryFromError(());
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl fmt::Display for CharTryFromError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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"converted integer out of range for `char`".fmt(f)
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@ -322,22 +322,26 @@ pub trait From<T>: Sized {
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///
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/// [`TryFrom`]: trait.TryFrom.html
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/// [`Into`]: trait.Into.html
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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pub trait TryInto<T>: Sized {
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/// The type returned in the event of a conversion error.
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#[stable(feature = "try_from", since = "1.26.0")]
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type Error;
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/// Performs the conversion.
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#[stable(feature = "try_from", since = "1.26.0")]
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fn try_into(self) -> Result<T, Self::Error>;
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}
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/// Attempt to construct `Self` via a conversion.
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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pub trait TryFrom<T>: Sized {
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/// The type returned in the event of a conversion error.
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#[stable(feature = "try_from", since = "1.26.0")]
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type Error;
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/// Performs the conversion.
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#[stable(feature = "try_from", since = "1.26.0")]
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fn try_from(value: T) -> Result<Self, Self::Error>;
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}
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@ -405,7 +409,7 @@ impl<T> From<T> for T {
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// TryFrom implies TryInto
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl<T, U> TryInto<U> for T where U: TryFrom<T>
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{
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type Error = U::Error;
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@ -417,7 +421,7 @@ impl<T, U> TryInto<U> for T where U: TryFrom<T>
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// Infallible conversions are semantically equivalent to fallible conversions
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// with an uninhabited error type.
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl<T, U> TryFrom<U> for T where T: From<U> {
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type Error = !;
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@ -3647,7 +3647,7 @@ macro_rules! from_str_radix_int_impl {
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from_str_radix_int_impl! { isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128 }
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/// The error type returned when a checked integral type conversion fails.
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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#[derive(Debug, Copy, Clone)]
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pub struct TryFromIntError(());
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@ -3662,14 +3662,14 @@ impl TryFromIntError {
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl fmt::Display for TryFromIntError {
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fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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self.__description().fmt(fmt)
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl From<!> for TryFromIntError {
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fn from(never: !) -> TryFromIntError {
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never
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@ -3679,7 +3679,7 @@ impl From<!> for TryFromIntError {
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// no possible bounds violation
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macro_rules! try_from_unbounded {
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($source:ty, $($target:ty),*) => {$(
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl TryFrom<$source> for $target {
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type Error = TryFromIntError;
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@ -3694,7 +3694,7 @@ macro_rules! try_from_unbounded {
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// only negative bounds
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macro_rules! try_from_lower_bounded {
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($source:ty, $($target:ty),*) => {$(
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl TryFrom<$source> for $target {
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type Error = TryFromIntError;
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@ -3713,7 +3713,7 @@ macro_rules! try_from_lower_bounded {
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// unsigned to signed (only positive bound)
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macro_rules! try_from_upper_bounded {
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($source:ty, $($target:ty),*) => {$(
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl TryFrom<$source> for $target {
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type Error = TryFromIntError;
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@ -3732,7 +3732,7 @@ macro_rules! try_from_upper_bounded {
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// all other cases
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macro_rules! try_from_both_bounded {
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($source:ty, $($target:ty),*) => {$(
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl TryFrom<$source> for $target {
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type Error = TryFromIntError;
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@ -43,7 +43,6 @@
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#![feature(step_trait)]
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#![feature(test)]
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#![feature(trusted_len)]
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#![feature(try_from)]
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#![feature(try_trait)]
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#![feature(exact_chunks)]
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#![feature(atomic_nand)]
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@ -48,7 +48,7 @@
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#![cfg_attr(stage0, feature(slice_patterns))]
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#![cfg_attr(stage0, feature(i128_type))]
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#![feature(try_from)]
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#![cfg_attr(stage0, feature(try_from))]
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// See librustc_cratesio_shim/Cargo.toml for a comment explaining this.
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#[allow(unused_extern_crates)]
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@ -275,14 +275,14 @@ impl Error for num::ParseIntError {
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl Error for num::TryFromIntError {
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fn description(&self) -> &str {
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self.__description()
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl Error for array::TryFromSliceError {
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fn description(&self) -> &str {
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self.__description()
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@ -356,7 +356,7 @@ impl Error for cell::BorrowMutError {
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}
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}
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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impl Error for char::CharTryFromError {
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fn description(&self) -> &str {
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"converted integer out of range for `char`"
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@ -310,7 +310,6 @@
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#![feature(test, rustc_private)]
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#![feature(thread_local)]
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#![feature(toowned_clone_into)]
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#![feature(try_from)]
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#![feature(try_reserve)]
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#![feature(unboxed_closures)]
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#![feature(unicode)]
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@ -42,7 +42,7 @@ pub use core::char::{EscapeDebug, EscapeDefault, EscapeUnicode};
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pub use core::char::ParseCharError;
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// unstable re-exports
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#[unstable(feature = "try_from", issue = "33417")]
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#[stable(feature = "try_from", since = "1.26.0")]
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pub use core::char::CharTryFromError;
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#[unstable(feature = "decode_utf8", issue = "33906")]
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pub use core::char::{DecodeUtf8, decode_utf8};
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@ -39,7 +39,6 @@
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#![feature(lang_items)]
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#![feature(non_exhaustive)]
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#![feature(staged_api)]
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#![feature(try_from)]
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#![feature(unboxed_closures)]
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mod bool_trie;
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@ -8,8 +8,6 @@
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(try_from)]
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use std::marker::PhantomData;
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use std::convert::{TryFrom, AsRef};
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@ -1,5 +1,5 @@
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error[E0119]: conflicting implementations of trait `std::convert::AsRef<Q>` for type `std::boxed::Box<Q>`:
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--> $DIR/conflict-with-std.rs:17:1
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--> $DIR/conflict-with-std.rs:15:1
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LL | impl AsRef<Q> for Box<Q> { //~ ERROR conflicting implementations
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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@ -9,7 +9,7 @@ LL | impl AsRef<Q> for Box<Q> { //~ ERROR conflicting implementations
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where T: ?Sized;
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error[E0119]: conflicting implementations of trait `std::convert::From<S>` for type `S`:
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--> $DIR/conflict-with-std.rs:24:1
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--> $DIR/conflict-with-std.rs:22:1
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LL | impl From<S> for S { //~ ERROR conflicting implementations
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| ^^^^^^^^^^^^^^^^^^
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@ -18,7 +18,7 @@ LL | impl From<S> for S { //~ ERROR conflicting implementations
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- impl<T> std::convert::From<T> for T;
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error[E0119]: conflicting implementations of trait `std::convert::TryFrom<X>` for type `X`:
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--> $DIR/conflict-with-std.rs:31:1
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--> $DIR/conflict-with-std.rs:29:1
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LL | impl TryFrom<X> for X { //~ ERROR conflicting implementations
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| ^^^^^^^^^^^^^^^^^^^^^
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