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-rw-r--r--library/core/src/ops/drop.rs2
-rw-r--r--library/core/src/ops/function.rs25
-rw-r--r--library/core/src/ops/generator.rs2
-rw-r--r--library/core/src/ops/range.rs2
-rw-r--r--library/core/src/ops/try_trait.rs84
5 files changed, 100 insertions, 15 deletions
diff --git a/library/core/src/ops/drop.rs b/library/core/src/ops/drop.rs
index aa654aa55..de9ddb852 100644
--- a/library/core/src/ops/drop.rs
+++ b/library/core/src/ops/drop.rs
@@ -156,7 +156,7 @@ pub trait Drop {
/// handled by the compiler, but when using unsafe code, can sometimes occur
/// unintentionally, particularly when using [`ptr::drop_in_place`].
///
- /// [E0040]: ../../error-index.html#E0040
+ /// [E0040]: ../../error_codes/E0040.html
/// [`panic!`]: crate::panic!
/// [`mem::drop`]: drop
/// [`ptr::drop_in_place`]: crate::ptr::drop_in_place
diff --git a/library/core/src/ops/function.rs b/library/core/src/ops/function.rs
index c5a194b7d..8fdf22cf6 100644
--- a/library/core/src/ops/function.rs
+++ b/library/core/src/ops/function.rs
@@ -250,9 +250,10 @@ pub trait FnOnce<Args> {
mod impls {
#[stable(feature = "rust1", since = "1.0.0")]
- impl<A, F: ?Sized> Fn<A> for &F
+ #[rustc_const_unstable(feature = "const_fn_trait_ref_impls", issue = "101803")]
+ impl<A, F: ?Sized> const Fn<A> for &F
where
- F: Fn<A>,
+ F: ~const Fn<A>,
{
extern "rust-call" fn call(&self, args: A) -> F::Output {
(**self).call(args)
@@ -260,9 +261,10 @@ mod impls {
}
#[stable(feature = "rust1", since = "1.0.0")]
- impl<A, F: ?Sized> FnMut<A> for &F
+ #[rustc_const_unstable(feature = "const_fn_trait_ref_impls", issue = "101803")]
+ impl<A, F: ?Sized> const FnMut<A> for &F
where
- F: Fn<A>,
+ F: ~const Fn<A>,
{
extern "rust-call" fn call_mut(&mut self, args: A) -> F::Output {
(**self).call(args)
@@ -270,9 +272,10 @@ mod impls {
}
#[stable(feature = "rust1", since = "1.0.0")]
- impl<A, F: ?Sized> FnOnce<A> for &F
+ #[rustc_const_unstable(feature = "const_fn_trait_ref_impls", issue = "101803")]
+ impl<A, F: ?Sized> const FnOnce<A> for &F
where
- F: Fn<A>,
+ F: ~const Fn<A>,
{
type Output = F::Output;
@@ -282,9 +285,10 @@ mod impls {
}
#[stable(feature = "rust1", since = "1.0.0")]
- impl<A, F: ?Sized> FnMut<A> for &mut F
+ #[rustc_const_unstable(feature = "const_fn_trait_ref_impls", issue = "101803")]
+ impl<A, F: ?Sized> const FnMut<A> for &mut F
where
- F: FnMut<A>,
+ F: ~const FnMut<A>,
{
extern "rust-call" fn call_mut(&mut self, args: A) -> F::Output {
(*self).call_mut(args)
@@ -292,9 +296,10 @@ mod impls {
}
#[stable(feature = "rust1", since = "1.0.0")]
- impl<A, F: ?Sized> FnOnce<A> for &mut F
+ #[rustc_const_unstable(feature = "const_fn_trait_ref_impls", issue = "101803")]
+ impl<A, F: ?Sized> const FnOnce<A> for &mut F
where
- F: FnMut<A>,
+ F: ~const FnMut<A>,
{
type Output = F::Output;
extern "rust-call" fn call_once(self, args: A) -> F::Output {
diff --git a/library/core/src/ops/generator.rs b/library/core/src/ops/generator.rs
index b651b7b23..3ebd6f8cd 100644
--- a/library/core/src/ops/generator.rs
+++ b/library/core/src/ops/generator.rs
@@ -83,7 +83,7 @@ pub trait Generator<R = ()> {
/// `return` statement or implicitly as the last expression of a generator
/// literal. For example futures would use this as `Result<T, E>` as it
/// represents a completed future.
- #[lang = "generator_return"]
+ #[cfg_attr(bootstrap, lang = "generator_return")]
type Return;
/// Resumes the execution of this generator.
diff --git a/library/core/src/ops/range.rs b/library/core/src/ops/range.rs
index a3b148473..d29ae3561 100644
--- a/library/core/src/ops/range.rs
+++ b/library/core/src/ops/range.rs
@@ -677,7 +677,7 @@ pub enum Bound<T> {
impl<T> Bound<T> {
/// Converts from `&Bound<T>` to `Bound<&T>`.
#[inline]
- #[unstable(feature = "bound_as_ref", issue = "80996")]
+ #[stable(feature = "bound_as_ref_shared", since = "1.65.0")]
pub fn as_ref(&self) -> Bound<&T> {
match *self {
Included(ref x) => Included(x),
diff --git a/library/core/src/ops/try_trait.rs b/library/core/src/ops/try_trait.rs
index 02f7f62bf..10f041344 100644
--- a/library/core/src/ops/try_trait.rs
+++ b/library/core/src/ops/try_trait.rs
@@ -222,7 +222,87 @@ pub trait Try: FromResidual {
/// Every `Try` type needs to be recreatable from its own associated
/// `Residual` type, but can also have additional `FromResidual` implementations
/// to support interconversion with other `Try` types.
-#[rustc_on_unimplemented(
+#[cfg_attr(not(bootstrap), rustc_on_unimplemented(
+ on(
+ all(
+ from_desugaring = "QuestionMark",
+ _Self = "std::result::Result<T, E>",
+ R = "std::option::Option<std::convert::Infallible>"
+ ),
+ message = "the `?` operator can only be used on `Result`s, not `Option`s, \
+ in {ItemContext} that returns `Result`",
+ label = "use `.ok_or(...)?` to provide an error compatible with `{Self}`",
+ parent_label = "this function returns a `Result`"
+ ),
+ on(
+ all(
+ from_desugaring = "QuestionMark",
+ _Self = "std::result::Result<T, E>",
+ ),
+ // There's a special error message in the trait selection code for
+ // `From` in `?`, so this is not shown for result-in-result errors,
+ // and thus it can be phrased more strongly than `ControlFlow`'s.
+ message = "the `?` operator can only be used on `Result`s \
+ in {ItemContext} that returns `Result`",
+ label = "this `?` produces `{R}`, which is incompatible with `{Self}`",
+ parent_label = "this function returns a `Result`"
+ ),
+ on(
+ all(
+ from_desugaring = "QuestionMark",
+ _Self = "std::option::Option<T>",
+ R = "std::result::Result<T, E>",
+ ),
+ message = "the `?` operator can only be used on `Option`s, not `Result`s, \
+ in {ItemContext} that returns `Option`",
+ label = "use `.ok()?` if you want to discard the `{R}` error information",
+ parent_label = "this function returns an `Option`"
+ ),
+ on(
+ all(
+ from_desugaring = "QuestionMark",
+ _Self = "std::option::Option<T>",
+ ),
+ // `Option`-in-`Option` always works, as there's only one possible
+ // residual, so this can also be phrased strongly.
+ message = "the `?` operator can only be used on `Option`s \
+ in {ItemContext} that returns `Option`",
+ label = "this `?` produces `{R}`, which is incompatible with `{Self}`",
+ parent_label = "this function returns an `Option`"
+ ),
+ on(
+ all(
+ from_desugaring = "QuestionMark",
+ _Self = "std::ops::ControlFlow<B, C>",
+ R = "std::ops::ControlFlow<B, C>",
+ ),
+ message = "the `?` operator in {ItemContext} that returns `ControlFlow<B, _>` \
+ can only be used on other `ControlFlow<B, _>`s (with the same Break type)",
+ label = "this `?` produces `{R}`, which is incompatible with `{Self}`",
+ parent_label = "this function returns a `ControlFlow`",
+ note = "unlike `Result`, there's no `From`-conversion performed for `ControlFlow`"
+ ),
+ on(
+ all(
+ from_desugaring = "QuestionMark",
+ _Self = "std::ops::ControlFlow<B, C>",
+ // `R` is not a `ControlFlow`, as that case was matched previously
+ ),
+ message = "the `?` operator can only be used on `ControlFlow`s \
+ in {ItemContext} that returns `ControlFlow`",
+ label = "this `?` produces `{R}`, which is incompatible with `{Self}`",
+ parent_label = "this function returns a `ControlFlow`",
+ ),
+ on(
+ all(from_desugaring = "QuestionMark"),
+ message = "the `?` operator can only be used in {ItemContext} \
+ that returns `Result` or `Option` \
+ (or another type that implements `{FromResidual}`)",
+ label = "cannot use the `?` operator in {ItemContext} that returns `{Self}`",
+ parent_label = "this function should return `Result` or `Option` to accept `?`"
+ ),
+))]
+#[cfg_attr(bootstrap, rustc_on_unimplemented(
on(
all(
from_desugaring = "QuestionMark",
@@ -301,7 +381,7 @@ pub trait Try: FromResidual {
label = "cannot use the `?` operator in {ItemContext} that returns `{Self}`",
enclosing_scope = "this function should return `Result` or `Option` to accept `?`"
),
-)]
+))]
#[rustc_diagnostic_item = "FromResidual"]
#[unstable(feature = "try_trait_v2", issue = "84277")]
pub trait FromResidual<R = <Self as Try>::Residual> {
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-21 22:54:39 +0000