ParamType *p = static_cast<ParamType *> (clone ());
subst_mappings.on_param_subst (*p, arg);
- // there are two cases one where we substitute directly to a new PARAM and
- // otherwise
- if (arg.get_tyty ()->get_kind () == TyTy::TypeKind::PARAM)
+ const BaseType *resolved = arg.get_tyty ();
+ if (resolved->get_kind () == TyTy::TypeKind::PARAM)
{
- p->set_ty_ref (arg.get_tyty ()->get_ref ());
- return p;
+ const ParamType &pp = *static_cast<const ParamType *> (resolved);
+ if (pp.can_resolve ())
+ resolved = pp.resolve ();
}
// this is the new subst that this needs to pass
--- /dev/null
+#[lang = "sized"]
+pub trait Sized {}
+
+pub trait MyBinaryTrait<Rhs = Self> {
+ fn do_something(&self, rhs: &Rhs);
+}
+
+struct Foo<T> {
+ // { dg-warning "struct is never constructed" "" { target *-*-* } .-1 }
+ value: T,
+}
+
+impl<T> MyBinaryTrait for Foo<T> {
+ fn do_something(&self, _rhs: &Self) {}
+}
--- /dev/null
+/* { dg-output "a == b\r*\na != c\r*\n" }*/
+/* { dg-options "-w" } */
+
+mod core {
+ mod marker {
+ #[lang = "phantom_data"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub struct PhantomData<T: ?Sized>;
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ #[lang = "structural_peq"]
+ pub trait StructuralPartialEq {
+ // Empty.
+ }
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ #[lang = "structural_teq"]
+ pub trait StructuralEq {
+ // Empty.
+ }
+
+ #[lang = "sized"]
+ pub trait Sized {}
+ }
+
+ pub mod cmp {
+ use super::marker::Sized;
+
+ #[lang = "eq"]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ pub trait Eq: PartialEq<Self> {
+ fn assert_receiver_is_total_eq(&self) {}
+ }
+ }
+}
+
+use core::cmp::{Eq, PartialEq};
+
+// PartialEq for i32 and u32 so we can compare across types
+impl PartialEq<u32> for i32 {
+ fn eq(&self, other: &u32) -> bool {
+ *self >= 0 && (*self as u32) == *other
+ }
+}
+impl PartialEq<i32> for u32 {
+ fn eq(&self, other: &i32) -> bool {
+ *other >= 0 && *self == *other as u32
+ }
+}
+
+// Our generic struct
+struct Foo<T> {
+ value: T,
+}
+
+// Manual impl of PartialEq for different generic params
+impl<T, U> PartialEq<Foo<U>> for Foo<T>
+where
+ T: PartialEq<U>,
+{
+ fn eq(&self, other: &Foo<U>) -> bool {
+ self.value.eq(&other.value)
+ }
+}
+
+impl<T: PartialEq> Eq for Foo<T> {}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let a = Foo { value: 42i32 };
+ let b = Foo { value: 42u32 };
+ let c = Foo { value: 7u32 };
+
+ if a == b {
+ print("a == b");
+ } else {
+ print("a != b");
+ }
+
+ if a == c {
+ print("a == c");
+ } else {
+ print("a != c");
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "a == b\r*\na != c\r*\n" }*/
+/* { dg-options "-w" } */
+
+#[lang = "sized"]
+pub trait Sized {}
+
+#[lang = "eq"]
+pub trait PartialEq<Rhs: ?Sized = Self> {
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+}
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+struct Foo<T> {
+ value: T,
+}
+
+impl<T: PartialEq> PartialEq for Foo<T> {
+ fn eq(&self, other: &Self) -> bool {
+ self.value.eq(&other.value)
+ }
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let a = Foo { value: 42i32 };
+ let b = Foo { value: 42i32 };
+ let c = Foo { value: 99i32 };
+
+ if a == b {
+ print("a == b");
+ } else {
+ print("a != b");
+ }
+
+ if a == c {
+ print("a == c");
+ } else {
+ print("a != c");
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "a == b\r*\na != c\r*\n" }*/
+/* { dg-options "-w" } */
+
+#![feature(intrinsics)]
+
+mod core {
+ mod option {
+ // #[rustc_diagnostic_item = "option_type"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Option<T> {
+ /// No value
+ #[lang = "None"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ None,
+ /// Some value `T`
+ #[lang = "Some"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Some(#[stable(feature = "rust1", since = "1.0.0")] T),
+ }
+ }
+
+ mod marker {
+ #[lang = "phantom_data"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub struct PhantomData<T: ?Sized>;
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(PartialEq)]`")]
+ #[lang = "structural_peq"]
+ pub trait StructuralPartialEq {
+ // Empty.
+ }
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(Eq)]`")]
+ #[lang = "structural_teq"]
+ pub trait StructuralEq {
+ // Empty.
+ }
+
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[lang = "sized"]
+ // #[rustc_on_unimplemented(
+ // message = "the size for values of type `{Self}` cannot be known at compilation time",
+ // label = "doesn't have a size known at compile-time"
+ // )]
+ // #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
+ // #[rustc_specialization_trait]
+ pub trait Sized {
+ // Empty.
+ }
+ }
+
+ mod cmp {
+ use super::marker::Sized;
+ use super::option::Option;
+
+ // #[derive(Clone, Copy, PartialEq, Debug, Hash)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Ordering {
+ /// An ordering where a compared value is less than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Less = -1,
+ /// An ordering where a compared value is equal to another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Equal = 0,
+ /// An ordering where a compared value is greater than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Greater = 1,
+ }
+
+ #[lang = "eq"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} == {Rhs}`"
+ // )]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ /// This method tests for `self` and `other` values to be equal, and is used
+ /// by `==`.
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Eq: PartialEq<Self> {
+ // this method is used solely by #[deriving] to assert
+ // that every component of a type implements #[deriving]
+ // itself, the current deriving infrastructure means doing this
+ // assertion without using a method on this trait is nearly
+ // impossible.
+ //
+ // This should never be implemented by hand.
+ #[doc(hidden)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn assert_receiver_is_total_eq(&self) {}
+ }
+
+ #[lang = "partial_ord"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} < {Rhs}` and `{Self} > {Rhs}`"
+ // )]
+ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ /// This method returns an ordering between `self` and `other` values if one exists.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// let result = 1.0.partial_cmp(&2.0);
+ /// assert_eq!(result, Some(Ordering::Less));
+ ///
+ /// let result = 1.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Equal));
+ ///
+ /// let result = 2.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Greater));
+ /// ```
+ ///
+ /// When comparison is impossible:
+ ///
+ /// ```
+ /// let result = f64::NAN.partial_cmp(&1.0);
+ /// assert_eq!(result, None);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+
+ /// This method tests less than (for `self` and `other`) and is used by the `<` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 < 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 < 1.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn lt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests less than or equal to (for `self` and `other`) and is used by the `<=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 <= 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 <= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn le(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than (for `self` and `other`) and is used by the `>` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 > 2.0;
+ /// assert_eq!(result, false);
+ ///
+ /// let result = 2.0 > 2.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn gt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than or equal to (for `self` and `other`) and is used by the `>=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 2.0 >= 1.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 >= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn ge(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+ }
+
+ #[doc(alias = "<")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Ord: Eq + PartialOrd<Self> {
+ /// This method returns an [`Ordering`] between `self` and `other`.
+ ///
+ /// By convention, `self.cmp(&other)` returns the ordering matching the expression
+ /// `self <operator> other` if true.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// assert_eq!(5.cmp(&10), Ordering::Less);
+ /// assert_eq!(10.cmp(&5), Ordering::Greater);
+ /// assert_eq!(5.cmp(&5), Ordering::Equal);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn cmp(&self, other: &Self) -> Ordering;
+
+ /// Compares and returns the maximum of two values.
+ ///
+ /// Returns the second argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(2, 1.max(2));
+ /// assert_eq!(2, 2.max(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn max(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Compares and returns the minimum of two values.
+ ///
+ /// Returns the first argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(1, 1.min(2));
+ /// assert_eq!(2, 2.min(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn min(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Restrict a value to a certain interval.
+ ///
+ /// Returns `max` if `self` is greater than `max`, and `min` if `self` is
+ /// less than `min`. Otherwise this returns `self`.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `min > max`.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// #![feature(clamp)]
+ ///
+ /// assert!((-3).clamp(-2, 1) == -2);
+ /// assert!(0.clamp(-2, 1) == 0);
+ /// assert!(2.clamp(-2, 1) == 1);
+ /// ```
+ #[must_use]
+ #[unstable(feature = "clamp", issue = "44095")]
+ fn clamp(self, min: Self, max: Self) -> Self
+ where
+ Self: Sized,
+ {
+ if self < min {
+ min
+ } else if self > max {
+ max
+ } else {
+ self
+ }
+ }
+ }
+ }
+
+ pub mod intrinsics {
+ #[lang = "discriminant_kind"]
+ pub trait DiscriminantKind {
+ #[lang = "discriminant_type"]
+ type Discriminant;
+ }
+
+ extern "rust-intrinsic" {
+ pub fn discriminant_value<T>(v: &T) -> <T as DiscriminantKind>::Discriminant;
+ }
+ }
+}
+
+use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
+use core::marker::Sized;
+use core::option::Option;
+
+// for comparing discriminant_value
+impl PartialEq for isize {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+// for comparing discriminant_value
+impl PartialOrd for isize {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+impl Eq for i32 {}
+
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl Ord for i32 {
+ fn cmp(&self, other: &Self) -> Ordering {
+ if *self > *other {
+ Ordering::Greater
+ } else if *self < *other {
+ Ordering::Less
+ } else {
+ Ordering::Equal
+ }
+ }
+}
+
+#[derive(PartialEq)]
+struct Foo {
+ a: i32,
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let a = Foo { a: 42i32 };
+ let b = Foo { a: 42i32 };
+ let c = Foo { a: 7i32 };
+
+ if a == b {
+ print("a == b");
+ } else {
+ print("a != b");
+ }
+
+ if a == c {
+ print("a == c");
+ } else {
+ print("a != c");
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "a == b\r*\na != c\r*\n" }*/
+/* { dg-options "-w" } */
+
+#![feature(intrinsics)]
+
+mod core {
+ mod option {
+ // #[rustc_diagnostic_item = "option_type"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Option<T> {
+ /// No value
+ #[lang = "None"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ None,
+ /// Some value `T`
+ #[lang = "Some"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Some(#[stable(feature = "rust1", since = "1.0.0")] T),
+ }
+ }
+
+ mod marker {
+ #[lang = "phantom_data"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub struct PhantomData<T: ?Sized>;
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(PartialEq)]`")]
+ #[lang = "structural_peq"]
+ pub trait StructuralPartialEq {
+ // Empty.
+ }
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(Eq)]`")]
+ #[lang = "structural_teq"]
+ pub trait StructuralEq {
+ // Empty.
+ }
+
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[lang = "sized"]
+ // #[rustc_on_unimplemented(
+ // message = "the size for values of type `{Self}` cannot be known at compilation time",
+ // label = "doesn't have a size known at compile-time"
+ // )]
+ // #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
+ // #[rustc_specialization_trait]
+ pub trait Sized {
+ // Empty.
+ }
+ }
+
+ mod cmp {
+ use super::marker::Sized;
+ use super::option::Option;
+
+ // #[derive(Clone, Copy, PartialEq, Debug, Hash)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Ordering {
+ /// An ordering where a compared value is less than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Less = -1,
+ /// An ordering where a compared value is equal to another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Equal = 0,
+ /// An ordering where a compared value is greater than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Greater = 1,
+ }
+
+ #[lang = "eq"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} == {Rhs}`"
+ // )]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ /// This method tests for `self` and `other` values to be equal, and is used
+ /// by `==`.
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Eq: PartialEq<Self> {
+ // this method is used solely by #[deriving] to assert
+ // that every component of a type implements #[deriving]
+ // itself, the current deriving infrastructure means doing this
+ // assertion without using a method on this trait is nearly
+ // impossible.
+ //
+ // This should never be implemented by hand.
+ #[doc(hidden)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn assert_receiver_is_total_eq(&self) {}
+ }
+
+ #[lang = "partial_ord"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} < {Rhs}` and `{Self} > {Rhs}`"
+ // )]
+ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ /// This method returns an ordering between `self` and `other` values if one exists.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// let result = 1.0.partial_cmp(&2.0);
+ /// assert_eq!(result, Some(Ordering::Less));
+ ///
+ /// let result = 1.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Equal));
+ ///
+ /// let result = 2.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Greater));
+ /// ```
+ ///
+ /// When comparison is impossible:
+ ///
+ /// ```
+ /// let result = f64::NAN.partial_cmp(&1.0);
+ /// assert_eq!(result, None);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+
+ /// This method tests less than (for `self` and `other`) and is used by the `<` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 < 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 < 1.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn lt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests less than or equal to (for `self` and `other`) and is used by the `<=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 <= 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 <= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn le(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than (for `self` and `other`) and is used by the `>` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 > 2.0;
+ /// assert_eq!(result, false);
+ ///
+ /// let result = 2.0 > 2.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn gt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than or equal to (for `self` and `other`) and is used by the `>=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 2.0 >= 1.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 >= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn ge(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+ }
+
+ #[doc(alias = "<")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Ord: Eq + PartialOrd<Self> {
+ /// This method returns an [`Ordering`] between `self` and `other`.
+ ///
+ /// By convention, `self.cmp(&other)` returns the ordering matching the expression
+ /// `self <operator> other` if true.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// assert_eq!(5.cmp(&10), Ordering::Less);
+ /// assert_eq!(10.cmp(&5), Ordering::Greater);
+ /// assert_eq!(5.cmp(&5), Ordering::Equal);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn cmp(&self, other: &Self) -> Ordering;
+
+ /// Compares and returns the maximum of two values.
+ ///
+ /// Returns the second argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(2, 1.max(2));
+ /// assert_eq!(2, 2.max(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn max(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Compares and returns the minimum of two values.
+ ///
+ /// Returns the first argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(1, 1.min(2));
+ /// assert_eq!(2, 2.min(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn min(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Restrict a value to a certain interval.
+ ///
+ /// Returns `max` if `self` is greater than `max`, and `min` if `self` is
+ /// less than `min`. Otherwise this returns `self`.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `min > max`.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// #![feature(clamp)]
+ ///
+ /// assert!((-3).clamp(-2, 1) == -2);
+ /// assert!(0.clamp(-2, 1) == 0);
+ /// assert!(2.clamp(-2, 1) == 1);
+ /// ```
+ #[must_use]
+ #[unstable(feature = "clamp", issue = "44095")]
+ fn clamp(self, min: Self, max: Self) -> Self
+ where
+ Self: Sized,
+ {
+ if self < min {
+ min
+ } else if self > max {
+ max
+ } else {
+ self
+ }
+ }
+ }
+ }
+
+ pub mod intrinsics {
+ #[lang = "discriminant_kind"]
+ pub trait DiscriminantKind {
+ #[lang = "discriminant_type"]
+ type Discriminant;
+ }
+
+ extern "rust-intrinsic" {
+ pub fn discriminant_value<T>(v: &T) -> <T as DiscriminantKind>::Discriminant;
+ }
+ }
+}
+
+use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
+use core::marker::Sized;
+use core::option::Option;
+
+// for comparing discriminant_value
+impl PartialEq for isize {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+// for comparing discriminant_value
+impl PartialOrd for isize {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+impl Eq for i32 {}
+
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl Ord for i32 {
+ fn cmp(&self, other: &Self) -> Ordering {
+ if *self > *other {
+ Ordering::Greater
+ } else if *self < *other {
+ Ordering::Less
+ } else {
+ Ordering::Equal
+ }
+ }
+}
+
+#[derive(PartialEq, Eq)]
+struct Foo {
+ a: i32,
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let a = Foo { a: 42i32 };
+ let b = Foo { a: 42i32 };
+ let c = Foo { a: 7i32 };
+
+ if a == b {
+ print("a == b");
+ } else {
+ print("a != b");
+ }
+
+ if a == c {
+ print("a == c");
+ } else {
+ print("a != c");
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "x == y\r*\nx > z\r*\n" }*/
+#[lang = "sized"]
+pub trait Sized {}
+
+pub enum Option<T> {
+ #[lang = "None"]
+ None,
+ #[lang = "Some"]
+ Some(T),
+}
+
+use Option::{None, Some};
+
+#[lang = "eq"]
+pub trait PartialEq<Rhs: ?Sized = Self> {
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+}
+
+pub enum Ordering {
+ Less = -1,
+ Equal = 0,
+ Greater = 1,
+}
+
+#[lang = "partial_ord"]
+pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+}
+
+// Implement for i32
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+// Implement PartialOrd for i32
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self < *other {
+ Some(Ordering::Less)
+ } else if *self > *other {
+ Some(Ordering::Greater)
+ } else {
+ Some(Ordering::Equal)
+ }
+ }
+}
+
+// Struct with manual PartialEq
+struct Foo {
+ a: i32,
+}
+
+impl PartialEq for Foo {
+ fn eq(&self, other: &Self) -> bool {
+ self.a.eq(&other.a)
+ }
+}
+
+impl PartialOrd for Foo {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ self.a.partial_cmp(&other.a)
+ }
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let x = Foo { a: 42 };
+ let y = Foo { a: 42 };
+ let z = Foo { a: 7 };
+
+ match x.partial_cmp(&y) {
+ Some(Ordering::Equal) => print("x == y"),
+ Some(Ordering::Less) => print("x < y"),
+ Some(Ordering::Greater) => print("x > y"),
+ None => print("x ? y"),
+ }
+
+ match x.partial_cmp(&z) {
+ Some(Ordering::Equal) => print("x == z"),
+ Some(Ordering::Less) => print("x < z"),
+ Some(Ordering::Greater) => print("x > z"),
+ None => print("x ? z"),
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "x == y\r*\nx > z\r*\n" }*/
+
+#![feature(intrinsics)]
+
+mod core {
+ mod option {
+ // #[rustc_diagnostic_item = "option_type"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Option<T> {
+ /// No value
+ #[lang = "None"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ None,
+ /// Some value `T`
+ #[lang = "Some"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Some(#[stable(feature = "rust1", since = "1.0.0")] T),
+ }
+ }
+
+ mod marker {
+ #[lang = "phantom_data"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub struct PhantomData<T: ?Sized>;
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(PartialEq)]`")]
+ #[lang = "structural_peq"]
+ pub trait StructuralPartialEq {
+ // Empty.
+ }
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(Eq)]`")]
+ #[lang = "structural_teq"]
+ pub trait StructuralEq {
+ // Empty.
+ }
+
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[lang = "sized"]
+ // #[rustc_on_unimplemented(
+ // message = "the size for values of type `{Self}` cannot be known at compilation time",
+ // label = "doesn't have a size known at compile-time"
+ // )]
+ // #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
+ // #[rustc_specialization_trait]
+ pub trait Sized {
+ // Empty.
+ }
+ }
+
+ mod cmp {
+ use super::marker::Sized;
+ use super::option::Option;
+
+ // #[derive(Clone, Copy, PartialEq, Debug, Hash)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Ordering {
+ /// An ordering where a compared value is less than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Less = -1,
+ /// An ordering where a compared value is equal to another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Equal = 0,
+ /// An ordering where a compared value is greater than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Greater = 1,
+ }
+
+ #[lang = "eq"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} == {Rhs}`"
+ // )]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ /// This method tests for `self` and `other` values to be equal, and is used
+ /// by `==`.
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Eq: PartialEq<Self> {
+ // this method is used solely by #[deriving] to assert
+ // that every component of a type implements #[deriving]
+ // itself, the current deriving infrastructure means doing this
+ // assertion without using a method on this trait is nearly
+ // impossible.
+ //
+ // This should never be implemented by hand.
+ #[doc(hidden)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn assert_receiver_is_total_eq(&self) {}
+ }
+
+ #[lang = "partial_ord"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} < {Rhs}` and `{Self} > {Rhs}`"
+ // )]
+ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ /// This method returns an ordering between `self` and `other` values if one exists.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// let result = 1.0.partial_cmp(&2.0);
+ /// assert_eq!(result, Some(Ordering::Less));
+ ///
+ /// let result = 1.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Equal));
+ ///
+ /// let result = 2.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Greater));
+ /// ```
+ ///
+ /// When comparison is impossible:
+ ///
+ /// ```
+ /// let result = f64::NAN.partial_cmp(&1.0);
+ /// assert_eq!(result, None);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+
+ /// This method tests less than (for `self` and `other`) and is used by the `<` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 < 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 < 1.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn lt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests less than or equal to (for `self` and `other`) and is used by the `<=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 <= 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 <= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn le(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than (for `self` and `other`) and is used by the `>` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 > 2.0;
+ /// assert_eq!(result, false);
+ ///
+ /// let result = 2.0 > 2.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn gt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than or equal to (for `self` and `other`) and is used by the `>=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 2.0 >= 1.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 >= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn ge(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+ }
+
+ #[doc(alias = "<")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Ord: Eq + PartialOrd<Self> {
+ /// This method returns an [`Ordering`] between `self` and `other`.
+ ///
+ /// By convention, `self.cmp(&other)` returns the ordering matching the expression
+ /// `self <operator> other` if true.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// assert_eq!(5.cmp(&10), Ordering::Less);
+ /// assert_eq!(10.cmp(&5), Ordering::Greater);
+ /// assert_eq!(5.cmp(&5), Ordering::Equal);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn cmp(&self, other: &Self) -> Ordering;
+
+ /// Compares and returns the maximum of two values.
+ ///
+ /// Returns the second argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(2, 1.max(2));
+ /// assert_eq!(2, 2.max(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn max(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Compares and returns the minimum of two values.
+ ///
+ /// Returns the first argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(1, 1.min(2));
+ /// assert_eq!(2, 2.min(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn min(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Restrict a value to a certain interval.
+ ///
+ /// Returns `max` if `self` is greater than `max`, and `min` if `self` is
+ /// less than `min`. Otherwise this returns `self`.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `min > max`.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// #![feature(clamp)]
+ ///
+ /// assert!((-3).clamp(-2, 1) == -2);
+ /// assert!(0.clamp(-2, 1) == 0);
+ /// assert!(2.clamp(-2, 1) == 1);
+ /// ```
+ #[must_use]
+ #[unstable(feature = "clamp", issue = "44095")]
+ fn clamp(self, min: Self, max: Self) -> Self
+ where
+ Self: Sized,
+ {
+ if self < min {
+ min
+ } else if self > max {
+ max
+ } else {
+ self
+ }
+ }
+ }
+ }
+
+ pub mod intrinsics {
+ #[lang = "discriminant_kind"]
+ pub trait DiscriminantKind {
+ #[lang = "discriminant_type"]
+ type Discriminant;
+ }
+
+ extern "rust-intrinsic" {
+ pub fn discriminant_value<T>(v: &T) -> <T as DiscriminantKind>::Discriminant;
+ }
+ }
+}
+
+use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
+use core::marker::Sized;
+use core::option::Option;
+
+// for comparing discriminant_value
+impl PartialEq for isize {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+// for comparing discriminant_value
+impl PartialOrd for isize {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+impl Eq for i32 {}
+
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl Ord for i32 {
+ fn cmp(&self, other: &Self) -> Ordering {
+ if *self > *other {
+ Ordering::Greater
+ } else if *self < *other {
+ Ordering::Less
+ } else {
+ Ordering::Equal
+ }
+ }
+}
+
+struct Foo {
+ a: i32,
+}
+
+impl PartialEq for Foo {
+ fn eq(&self, other: &'_ Self) -> bool {
+ self.a == other.a
+ }
+}
+
+impl PartialOrd for Foo {
+ fn partial_cmp(&self, other: &'_ Foo) -> Option<::core::cmp::Ordering> {
+ self.a.partial_cmp(&other.a)
+ }
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let x = Foo { a: 42 };
+ let y = Foo { a: 42 };
+ let z = Foo { a: 7 };
+
+ match x.partial_cmp(&y) {
+ Option::Some(Ordering::Equal) => print("x == y"),
+ Option::Some(Ordering::Less) => print("x < y"),
+ Option::Some(Ordering::Greater) => print("x > y"),
+ Option::None => print("x ? y"),
+ }
+
+ match x.partial_cmp(&z) {
+ Option::Some(Ordering::Equal) => print("x == z"),
+ Option::Some(Ordering::Less) => print("x < z"),
+ Option::Some(Ordering::Greater) => print("x > z"),
+ Option::None => print("x ? z"),
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "x == y\r*\nx > z\r*\nx < z\r*\nx >= y\r*\nx <= y\r*\n" } */
+/* { dg-options "-w" } */
+
+#![feature(intrinsics)]
+
+mod core {
+ mod option {
+ // #[rustc_diagnostic_item = "option_type"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Option<T> {
+ /// No value
+ #[lang = "None"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ None,
+ /// Some value `T`
+ #[lang = "Some"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Some(#[stable(feature = "rust1", since = "1.0.0")] T),
+ }
+ }
+
+ mod marker {
+ #[lang = "phantom_data"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub struct PhantomData<T: ?Sized>;
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(PartialEq)]`")]
+ #[lang = "structural_peq"]
+ pub trait StructuralPartialEq {
+ // Empty.
+ }
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(Eq)]`")]
+ #[lang = "structural_teq"]
+ pub trait StructuralEq {
+ // Empty.
+ }
+
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[lang = "sized"]
+ // #[rustc_on_unimplemented(
+ // message = "the size for values of type `{Self}` cannot be known at compilation time",
+ // label = "doesn't have a size known at compile-time"
+ // )]
+ // #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
+ // #[rustc_specialization_trait]
+ pub trait Sized {
+ // Empty.
+ }
+ }
+
+ mod cmp {
+ use super::marker::Sized;
+ use super::option::Option;
+
+ // #[derive(Clone, Copy, PartialEq, Debug, Hash)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Ordering {
+ /// An ordering where a compared value is less than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Less = -1,
+ /// An ordering where a compared value is equal to another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Equal = 0,
+ /// An ordering where a compared value is greater than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Greater = 1,
+ }
+
+ #[lang = "eq"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} == {Rhs}`"
+ // )]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ /// This method tests for `self` and `other` values to be equal, and is used
+ /// by `==`.
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Eq: PartialEq<Self> {
+ // this method is used solely by #[deriving] to assert
+ // that every component of a type implements #[deriving]
+ // itself, the current deriving infrastructure means doing this
+ // assertion without using a method on this trait is nearly
+ // impossible.
+ //
+ // This should never be implemented by hand.
+ #[doc(hidden)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn assert_receiver_is_total_eq(&self) {}
+ }
+
+ #[lang = "partial_ord"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} < {Rhs}` and `{Self} > {Rhs}`"
+ // )]
+ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ /// This method returns an ordering between `self` and `other` values if one exists.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// let result = 1.0.partial_cmp(&2.0);
+ /// assert_eq!(result, Some(Ordering::Less));
+ ///
+ /// let result = 1.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Equal));
+ ///
+ /// let result = 2.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Greater));
+ /// ```
+ ///
+ /// When comparison is impossible:
+ ///
+ /// ```
+ /// let result = f64::NAN.partial_cmp(&1.0);
+ /// assert_eq!(result, None);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+
+ /// This method tests less than (for `self` and `other`) and is used by the `<` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 < 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 < 1.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn lt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests less than or equal to (for `self` and `other`) and is used by the `<=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 <= 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 <= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn le(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than (for `self` and `other`) and is used by the `>` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 > 2.0;
+ /// assert_eq!(result, false);
+ ///
+ /// let result = 2.0 > 2.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn gt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than or equal to (for `self` and `other`) and is used by the `>=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 2.0 >= 1.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 >= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn ge(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+ }
+
+ #[doc(alias = "<")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Ord: Eq + PartialOrd<Self> {
+ /// This method returns an [`Ordering`] between `self` and `other`.
+ ///
+ /// By convention, `self.cmp(&other)` returns the ordering matching the expression
+ /// `self <operator> other` if true.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// assert_eq!(5.cmp(&10), Ordering::Less);
+ /// assert_eq!(10.cmp(&5), Ordering::Greater);
+ /// assert_eq!(5.cmp(&5), Ordering::Equal);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn cmp(&self, other: &Self) -> Ordering;
+
+ /// Compares and returns the maximum of two values.
+ ///
+ /// Returns the second argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(2, 1.max(2));
+ /// assert_eq!(2, 2.max(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn max(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Compares and returns the minimum of two values.
+ ///
+ /// Returns the first argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(1, 1.min(2));
+ /// assert_eq!(2, 2.min(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn min(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Restrict a value to a certain interval.
+ ///
+ /// Returns `max` if `self` is greater than `max`, and `min` if `self` is
+ /// less than `min`. Otherwise this returns `self`.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `min > max`.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// #![feature(clamp)]
+ ///
+ /// assert!((-3).clamp(-2, 1) == -2);
+ /// assert!(0.clamp(-2, 1) == 0);
+ /// assert!(2.clamp(-2, 1) == 1);
+ /// ```
+ #[must_use]
+ #[unstable(feature = "clamp", issue = "44095")]
+ fn clamp(self, min: Self, max: Self) -> Self
+ where
+ Self: Sized,
+ {
+ if self < min {
+ min
+ } else if self > max {
+ max
+ } else {
+ self
+ }
+ }
+ }
+ }
+
+ pub mod intrinsics {
+ #[lang = "discriminant_kind"]
+ pub trait DiscriminantKind {
+ #[lang = "discriminant_type"]
+ type Discriminant;
+ }
+
+ extern "rust-intrinsic" {
+ pub fn discriminant_value<T>(v: &T) -> <T as DiscriminantKind>::Discriminant;
+ }
+ }
+}
+
+use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
+use core::marker::Sized;
+use core::option::Option;
+
+// for comparing discriminant_value
+impl PartialEq for isize {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+// for comparing discriminant_value
+impl PartialOrd for isize {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+impl Eq for i32 {}
+
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl Ord for i32 {
+ fn cmp(&self, other: &Self) -> Ordering {
+ if *self > *other {
+ Ordering::Greater
+ } else if *self < *other {
+ Ordering::Less
+ } else {
+ Ordering::Equal
+ }
+ }
+}
+
+struct Foo {
+ a: i32,
+}
+
+impl PartialEq for Foo {
+ fn eq(&self, other: &Self) -> bool {
+ self.a == other.a
+ }
+}
+impl Eq for Foo {}
+
+impl PartialOrd for Foo {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ self.a.partial_cmp(&other.a)
+ }
+}
+
+impl Ord for Foo {
+ fn cmp(&self, other: &Self) -> Ordering {
+ self.a.cmp(&other.a)
+ }
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let x = Foo { a: 42 };
+ let y = Foo { a: 42 };
+ let z = Foo { a: 7 };
+
+ // test direct equality
+ if x == y {
+ print("x == y");
+ }
+
+ // test PartialOrd via match
+ match x.partial_cmp(&z) {
+ Option::Some(Ordering::Greater) => print("x > z"),
+ _ => print("x ? z"),
+ }
+
+ // test `<` directly
+ if z < x {
+ print("x < z");
+ }
+
+ // test `>=`
+ if x >= y {
+ print("x >= y");
+ }
+
+ // test `<=`
+ if x <= y {
+ print("x <= y");
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "a == b\r*\na != c\r*\n" }*/
+/* { dg-options "-w" } */
+
+#![feature(intrinsics)]
+
+mod core {
+ mod option {
+ pub enum Option<T> {
+ #[lang = "None"]
+ None,
+ #[lang = "Some"]
+ Some(T),
+ }
+ }
+
+ mod marker {
+ #[lang = "sized"]
+ pub trait Sized {}
+ }
+
+ mod cmp {
+ use super::marker::Sized;
+ use super::option::Option;
+
+ pub enum Ordering {
+ Less = -1,
+ Equal = 0,
+ Greater = 1,
+ }
+
+ #[lang = "eq"]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ #[lang = "partial_ord"]
+ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+ }
+ }
+}
+
+use core::cmp::{Ordering, PartialEq, PartialOrd};
+use core::marker::Sized;
+use core::option::Option;
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+}
+
+struct Foo {
+ a: i32,
+}
+
+impl PartialEq for Foo {
+ fn eq(&self, other: &'_ Self) -> bool {
+ self.a == other.a
+ }
+}
+
+impl PartialOrd for Foo {
+ fn partial_cmp(&self, other: &'_ Foo) -> Option<::core::cmp::Ordering> {
+ ::core::cmp::PartialOrd::partial_cmp(&self.a, &other.a)
+ }
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let a = Foo { a: 42i32 };
+ let b = Foo { a: 42i32 };
+ let c = Foo { a: 7i32 };
+
+ if a == b {
+ print("a == b");
+ } else {
+ print("a != b");
+ }
+
+ if a == c {
+ print("a == c");
+ } else {
+ print("a != c");
+ }
+
+ 0
+}
--- /dev/null
+/* { dg-output "a == b\r*\na != c\r*\na >= c\r*\na <= b\r*\na > c\r*\nc < b\r*\n" } */
+/* { dg-options "-w" } */
+
+#![feature(intrinsics)]
+
+mod core {
+ mod option {
+ // #[rustc_diagnostic_item = "option_type"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Option<T> {
+ /// No value
+ #[lang = "None"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ None,
+ /// Some value `T`
+ #[lang = "Some"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Some(#[stable(feature = "rust1", since = "1.0.0")] T),
+ }
+ }
+
+ mod marker {
+ #[lang = "phantom_data"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub struct PhantomData<T: ?Sized>;
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(PartialEq)]`")]
+ #[lang = "structural_peq"]
+ pub trait StructuralPartialEq {
+ // Empty.
+ }
+
+ #[unstable(feature = "structural_match", issue = "31434")]
+ // #[rustc_on_unimplemented(message = "the type `{Self}` does not `#[derive(Eq)]`")]
+ #[lang = "structural_teq"]
+ pub trait StructuralEq {
+ // Empty.
+ }
+
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[lang = "sized"]
+ // #[rustc_on_unimplemented(
+ // message = "the size for values of type `{Self}` cannot be known at compilation time",
+ // label = "doesn't have a size known at compile-time"
+ // )]
+ // #[fundamental] // for Default, for example, which requires that `[T]: !Default` be evaluatable
+ // #[rustc_specialization_trait]
+ pub trait Sized {
+ // Empty.
+ }
+ }
+
+ mod cmp {
+ use super::marker::Sized;
+ use super::option::Option;
+
+ // #[derive(Clone, Copy, PartialEq, Debug, Hash)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub enum Ordering {
+ /// An ordering where a compared value is less than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Less = -1,
+ /// An ordering where a compared value is equal to another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Equal = 0,
+ /// An ordering where a compared value is greater than another.
+ #[stable(feature = "rust1", since = "1.0.0")]
+ Greater = 1,
+ }
+
+ #[lang = "eq"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} == {Rhs}`"
+ // )]
+ pub trait PartialEq<Rhs: ?Sized = Self> {
+ /// This method tests for `self` and `other` values to be equal, and is used
+ /// by `==`.
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn eq(&self, other: &Rhs) -> bool;
+
+ fn ne(&self, other: &Rhs) -> bool {
+ !self.eq(other)
+ }
+ }
+
+ #[doc(alias = "==")]
+ #[doc(alias = "!=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Eq: PartialEq<Self> {
+ // this method is used solely by #[deriving] to assert
+ // that every component of a type implements #[deriving]
+ // itself, the current deriving infrastructure means doing this
+ // assertion without using a method on this trait is nearly
+ // impossible.
+ //
+ // This should never be implemented by hand.
+ #[doc(hidden)]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn assert_receiver_is_total_eq(&self) {}
+ }
+
+ #[lang = "partial_ord"]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ // #[rustc_on_unimplemented(
+ // message = "can't compare `{Self}` with `{Rhs}`",
+ // label = "no implementation for `{Self} < {Rhs}` and `{Self} > {Rhs}`"
+ // )]
+ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
+ /// This method returns an ordering between `self` and `other` values if one exists.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// let result = 1.0.partial_cmp(&2.0);
+ /// assert_eq!(result, Some(Ordering::Less));
+ ///
+ /// let result = 1.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Equal));
+ ///
+ /// let result = 2.0.partial_cmp(&1.0);
+ /// assert_eq!(result, Some(Ordering::Greater));
+ /// ```
+ ///
+ /// When comparison is impossible:
+ ///
+ /// ```
+ /// let result = f64::NAN.partial_cmp(&1.0);
+ /// assert_eq!(result, None);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn partial_cmp(&self, other: &Rhs) -> Option<Ordering>;
+
+ /// This method tests less than (for `self` and `other`) and is used by the `<` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 < 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 < 1.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn lt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests less than or equal to (for `self` and `other`) and is used by the `<=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 <= 2.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 <= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn le(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Less | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than (for `self` and `other`) and is used by the `>` operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 1.0 > 2.0;
+ /// assert_eq!(result, false);
+ ///
+ /// let result = 2.0 > 2.0;
+ /// assert_eq!(result, false);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn gt(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater) => true,
+ _ => false,
+ }
+ }
+
+ /// This method tests greater than or equal to (for `self` and `other`) and is used by the `>=`
+ /// operator.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let result = 2.0 >= 1.0;
+ /// assert_eq!(result, true);
+ ///
+ /// let result = 2.0 >= 2.0;
+ /// assert_eq!(result, true);
+ /// ```
+ #[inline]
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn ge(&self, other: &Rhs) -> bool {
+ match self.partial_cmp(other) {
+ Option::Some(Ordering::Greater | Ordering::Equal) => true,
+ _ => false,
+ }
+ }
+ }
+
+ #[doc(alias = "<")]
+ #[doc(alias = ">")]
+ #[doc(alias = "<=")]
+ #[doc(alias = ">=")]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub trait Ord: Eq + PartialOrd<Self> {
+ /// This method returns an [`Ordering`] between `self` and `other`.
+ ///
+ /// By convention, `self.cmp(&other)` returns the ordering matching the expression
+ /// `self <operator> other` if true.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::cmp::Ordering;
+ ///
+ /// assert_eq!(5.cmp(&10), Ordering::Less);
+ /// assert_eq!(10.cmp(&5), Ordering::Greater);
+ /// assert_eq!(5.cmp(&5), Ordering::Equal);
+ /// ```
+ #[must_use]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ fn cmp(&self, other: &Self) -> Ordering;
+
+ /// Compares and returns the maximum of two values.
+ ///
+ /// Returns the second argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(2, 1.max(2));
+ /// assert_eq!(2, 2.max(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn max(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Compares and returns the minimum of two values.
+ ///
+ /// Returns the first argument if the comparison determines them to be equal.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// assert_eq!(1, 1.min(2));
+ /// assert_eq!(2, 2.min(2));
+ /// ```
+ #[stable(feature = "ord_max_min", since = "1.21.0")]
+ #[must_use]
+ fn min(self, other: Self) -> Self
+ where
+ Self: Sized,
+ {
+ self
+ }
+
+ /// Restrict a value to a certain interval.
+ ///
+ /// Returns `max` if `self` is greater than `max`, and `min` if `self` is
+ /// less than `min`. Otherwise this returns `self`.
+ ///
+ /// # Panics
+ ///
+ /// Panics if `min > max`.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// #![feature(clamp)]
+ ///
+ /// assert!((-3).clamp(-2, 1) == -2);
+ /// assert!(0.clamp(-2, 1) == 0);
+ /// assert!(2.clamp(-2, 1) == 1);
+ /// ```
+ #[must_use]
+ #[unstable(feature = "clamp", issue = "44095")]
+ fn clamp(self, min: Self, max: Self) -> Self
+ where
+ Self: Sized,
+ {
+ if self < min {
+ min
+ } else if self > max {
+ max
+ } else {
+ self
+ }
+ }
+ }
+ }
+
+ pub mod intrinsics {
+ #[lang = "discriminant_kind"]
+ pub trait DiscriminantKind {
+ #[lang = "discriminant_type"]
+ type Discriminant;
+ }
+
+ extern "rust-intrinsic" {
+ pub fn discriminant_value<T>(v: &T) -> <T as DiscriminantKind>::Discriminant;
+ }
+ }
+}
+
+use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
+use core::marker::Sized;
+use core::option::Option;
+
+// for comparing discriminant_value
+impl PartialEq for isize {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+
+// for comparing discriminant_value
+impl PartialOrd for isize {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl PartialEq for i32 {
+ fn eq(&self, other: &Self) -> bool {
+ *self == *other
+ }
+}
+impl Eq for i32 {}
+
+impl PartialOrd for i32 {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ if *self > *other {
+ Option::Some(Ordering::Greater)
+ } else if *self < *other {
+ Option::Some(Ordering::Less)
+ } else {
+ Option::Some(Ordering::Equal)
+ }
+ }
+
+ fn lt(&self, other: &Self) -> bool {
+ *self < *other
+ }
+ fn le(&self, other: &Self) -> bool {
+ *self <= *other
+ }
+ fn ge(&self, other: &Self) -> bool {
+ *self >= *other
+ }
+ fn gt(&self, other: &Self) -> bool {
+ *self > *other
+ }
+}
+
+impl Ord for i32 {
+ fn cmp(&self, other: &Self) -> Ordering {
+ if *self > *other {
+ Ordering::Greater
+ } else if *self < *other {
+ Ordering::Less
+ } else {
+ Ordering::Equal
+ }
+ }
+}
+
+#[derive(PartialEq, Eq, Ord)]
+struct Foo {
+ a: i32,
+}
+
+impl PartialOrd for Foo {
+ fn partial_cmp(&self, other: &'_ Foo) -> Option<::core::cmp::Ordering> {
+ self.a.partial_cmp(&other.a)
+ }
+}
+
+extern "C" {
+ fn puts(s: *const i8);
+}
+
+fn print(s: &str) {
+ unsafe {
+ puts(s as *const str as *const i8);
+ }
+}
+
+fn main() -> i32 {
+ let a = Foo { a: 42 };
+ let b = Foo { a: 42 };
+ let c = Foo { a: 7 };
+
+ if a == b {
+ print("a == b");
+ } else {
+ print("a != b");
+ }
+
+ if a != c {
+ print("a != c");
+ } else {
+ print("a == c");
+ }
+
+ if a < c {
+ print("a < c");
+ } else {
+ print("a >= c");
+ }
+
+ if a <= b {
+ print("a <= b");
+ } else {
+ print("a > b");
+ }
+
+ if a > c {
+ print("a > c");
+ } else {
+ print("a <= c");
+ }
+
+ if c >= b {
+ print("c >= b");
+ } else {
+ print("c < b");
+ }
+
+ 0
+}
projects / thirdparty / gcc.git / commitdiff
