Auto merge of rust-lang#90314 - matthiaskrgr:rollup-ag1js8n, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang#90296 (Remove fNN::lerp)
 - rust-lang#90302 (Remove unneeded into_iter)
 - rust-lang#90303 (Add regression test for issue 90164)
 - rust-lang#90305 (Add regression test for rust-lang#87258)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Diff for: library/std/src/f32.rs

@@ -878,40 +878,4 @@ impl f32 {
     pub fn atanh(self) -> f32 {
         0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
     }
-
-    /// Linear interpolation between `start` and `end`.
-    ///
-    /// This enables linear interpolation between `start` and `end`, where start is represented by
-    /// `self == 0.0` and `end` is represented by `self == 1.0`. This is the basis of all
-    /// "transition", "easing", or "step" functions; if you change `self` from 0.0 to 1.0
-    /// at a given rate, the result will change from `start` to `end` at a similar rate.
-    ///
-    /// Values below 0.0 or above 1.0 are allowed, allowing you to extrapolate values outside the
-    /// range from `start` to `end`. This also is useful for transition functions which might
-    /// move slightly past the end or start for a desired effect. Mathematically, the values
-    /// returned are equivalent to `start + self * (end - start)`, although we make a few specific
-    /// guarantees that are useful specifically to linear interpolation.
-    ///
-    /// These guarantees are:
-    ///
-    /// * If `start` and `end` are [finite], the value at 0.0 is always `start` and the
-    ///   value at 1.0 is always `end`. (exactness)
-    /// * If `start` and `end` are [finite], the values will always move in the direction from
-    ///   `start` to `end` (monotonicity)
-    /// * If `self` is [finite] and `start == end`, the value at any point will always be
-    ///   `start == end`. (consistency)
-    ///
-    /// [finite]: #method.is_finite
-    #[must_use = "method returns a new number and does not mutate the original value"]
-    #[unstable(feature = "float_interpolation", issue = "86269")]
-    pub fn lerp(self, start: f32, end: f32) -> f32 {
-        // consistent
-        if start == end {
-            start
-
-        // exact/monotonic
-        } else {
-            self.mul_add(end, (-self).mul_add(start, start))
-        }
-    }
 }

Diff for: library/std/src/f32/tests.rs

@@ -757,66 +757,3 @@ fn test_total_cmp() {
     assert_eq!(Ordering::Less, (-s_nan()).total_cmp(&f32::INFINITY));
     assert_eq!(Ordering::Less, (-s_nan()).total_cmp(&s_nan()));
 }
-
-#[test]
-fn test_lerp_exact() {
-    // simple values
-    assert_eq!(f32::lerp(0.0, 2.0, 4.0), 2.0);
-    assert_eq!(f32::lerp(1.0, 2.0, 4.0), 4.0);
-
-    // boundary values
-    assert_eq!(f32::lerp(0.0, f32::MIN, f32::MAX), f32::MIN);
-    assert_eq!(f32::lerp(1.0, f32::MIN, f32::MAX), f32::MAX);
-}
-
-#[test]
-fn test_lerp_consistent() {
-    assert_eq!(f32::lerp(f32::MAX, f32::MIN, f32::MIN), f32::MIN);
-    assert_eq!(f32::lerp(f32::MIN, f32::MAX, f32::MAX), f32::MAX);
-
-    // as long as t is finite, a/b can be infinite
-    assert_eq!(f32::lerp(f32::MAX, f32::NEG_INFINITY, f32::NEG_INFINITY), f32::NEG_INFINITY);
-    assert_eq!(f32::lerp(f32::MIN, f32::INFINITY, f32::INFINITY), f32::INFINITY);
-}
-
-#[test]
-fn test_lerp_nan_infinite() {
-    // non-finite t is not NaN if a/b different
-    assert!(!f32::lerp(f32::INFINITY, f32::MIN, f32::MAX).is_nan());
-    assert!(!f32::lerp(f32::NEG_INFINITY, f32::MIN, f32::MAX).is_nan());
-}
-
-#[test]
-fn test_lerp_values() {
-    // just a few basic values
-    assert_eq!(f32::lerp(0.25, 1.0, 2.0), 1.25);
-    assert_eq!(f32::lerp(0.50, 1.0, 2.0), 1.50);
-    assert_eq!(f32::lerp(0.75, 1.0, 2.0), 1.75);
-}
-
-#[test]
-fn test_lerp_monotonic() {
-    // near 0
-    let below_zero = f32::lerp(-f32::EPSILON, f32::MIN, f32::MAX);
-    let zero = f32::lerp(0.0, f32::MIN, f32::MAX);
-    let above_zero = f32::lerp(f32::EPSILON, f32::MIN, f32::MAX);
-    assert!(below_zero <= zero);
-    assert!(zero <= above_zero);
-    assert!(below_zero <= above_zero);
-
-    // near 0.5
-    let below_half = f32::lerp(0.5 - f32::EPSILON, f32::MIN, f32::MAX);
-    let half = f32::lerp(0.5, f32::MIN, f32::MAX);
-    let above_half = f32::lerp(0.5 + f32::EPSILON, f32::MIN, f32::MAX);
-    assert!(below_half <= half);
-    assert!(half <= above_half);
-    assert!(below_half <= above_half);
-
-    // near 1
-    let below_one = f32::lerp(1.0 - f32::EPSILON, f32::MIN, f32::MAX);
-    let one = f32::lerp(1.0, f32::MIN, f32::MAX);
-    let above_one = f32::lerp(1.0 + f32::EPSILON, f32::MIN, f32::MAX);
-    assert!(below_one <= one);
-    assert!(one <= above_one);
-    assert!(below_one <= above_one);
-}

Diff for: library/std/src/f64.rs

@@ -881,42 +881,6 @@ impl f64 {
         0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
     }
 
-    /// Linear interpolation between `start` and `end`.
-    ///
-    /// This enables linear interpolation between `start` and `end`, where start is represented by
-    /// `self == 0.0` and `end` is represented by `self == 1.0`. This is the basis of all
-    /// "transition", "easing", or "step" functions; if you change `self` from 0.0 to 1.0
-    /// at a given rate, the result will change from `start` to `end` at a similar rate.
-    ///
-    /// Values below 0.0 or above 1.0 are allowed, allowing you to extrapolate values outside the
-    /// range from `start` to `end`. This also is useful for transition functions which might
-    /// move slightly past the end or start for a desired effect. Mathematically, the values
-    /// returned are equivalent to `start + self * (end - start)`, although we make a few specific
-    /// guarantees that are useful specifically to linear interpolation.
-    ///
-    /// These guarantees are:
-    ///
-    /// * If `start` and `end` are [finite], the value at 0.0 is always `start` and the
-    ///   value at 1.0 is always `end`. (exactness)
-    /// * If `start` and `end` are [finite], the values will always move in the direction from
-    ///   `start` to `end` (monotonicity)
-    /// * If `self` is [finite] and `start == end`, the value at any point will always be
-    ///   `start == end`. (consistency)
-    ///
-    /// [finite]: #method.is_finite
-    #[must_use = "method returns a new number and does not mutate the original value"]
-    #[unstable(feature = "float_interpolation", issue = "86269")]
-    pub fn lerp(self, start: f64, end: f64) -> f64 {
-        // consistent
-        if start == end {
-            start
-
-        // exact/monotonic
-        } else {
-            self.mul_add(end, (-self).mul_add(start, start))
-        }
-    }
-
     // Solaris/Illumos requires a wrapper around log, log2, and log10 functions
     // because of their non-standard behavior (e.g., log(-n) returns -Inf instead
     // of expected NaN).

Diff for: library/std/src/f64/tests.rs

@@ -753,58 +753,3 @@ fn test_total_cmp() {
     assert_eq!(Ordering::Less, (-s_nan()).total_cmp(&f64::INFINITY));
     assert_eq!(Ordering::Less, (-s_nan()).total_cmp(&s_nan()));
 }
-
-#[test]
-fn test_lerp_exact() {
-    // simple values
-    assert_eq!(f64::lerp(0.0, 2.0, 4.0), 2.0);
-    assert_eq!(f64::lerp(1.0, 2.0, 4.0), 4.0);
-
-    // boundary values
-    assert_eq!(f64::lerp(0.0, f64::MIN, f64::MAX), f64::MIN);
-    assert_eq!(f64::lerp(1.0, f64::MIN, f64::MAX), f64::MAX);
-}
-
-#[test]
-fn test_lerp_consistent() {
-    assert_eq!(f64::lerp(f64::MAX, f64::MIN, f64::MIN), f64::MIN);
-    assert_eq!(f64::lerp(f64::MIN, f64::MAX, f64::MAX), f64::MAX);
-
-    // as long as t is finite, a/b can be infinite
-    assert_eq!(f64::lerp(f64::MAX, f64::NEG_INFINITY, f64::NEG_INFINITY), f64::NEG_INFINITY);
-    assert_eq!(f64::lerp(f64::MIN, f64::INFINITY, f64::INFINITY), f64::INFINITY);
-}
-
-#[test]
-fn test_lerp_nan_infinite() {
-    // non-finite t is not NaN if a/b different
-    assert!(!f64::lerp(f64::INFINITY, f64::MIN, f64::MAX).is_nan());
-    assert!(!f64::lerp(f64::NEG_INFINITY, f64::MIN, f64::MAX).is_nan());
-}
-
-#[test]
-fn test_lerp_values() {
-    // just a few basic values
-    assert_eq!(f64::lerp(0.25, 1.0, 2.0), 1.25);
-    assert_eq!(f64::lerp(0.50, 1.0, 2.0), 1.50);
-    assert_eq!(f64::lerp(0.75, 1.0, 2.0), 1.75);
-}
-
-#[test]
-fn test_lerp_monotonic() {
-    // near 0
-    let below_zero = f64::lerp(-f64::EPSILON, f64::MIN, f64::MAX);
-    let zero = f64::lerp(0.0, f64::MIN, f64::MAX);
-    let above_zero = f64::lerp(f64::EPSILON, f64::MIN, f64::MAX);
-    assert!(below_zero <= zero);
-    assert!(zero <= above_zero);
-    assert!(below_zero <= above_zero);
-
-    // near 1
-    let below_one = f64::lerp(1.0 - f64::EPSILON, f64::MIN, f64::MAX);
-    let one = f64::lerp(1.0, f64::MIN, f64::MAX);
-    let above_one = f64::lerp(1.0 + f64::EPSILON, f64::MIN, f64::MAX);
-    assert!(below_one <= one);
-    assert!(one <= above_one);
-    assert!(below_one <= above_one);
-}

Diff for: library/std/src/lib.rs

@@ -284,7 +284,6 @@
 #![feature(exact_size_is_empty)]
 #![feature(exhaustive_patterns)]
 #![feature(extend_one)]
-#![feature(float_interpolation)]
 #![feature(fn_traits)]
 #![feature(format_args_nl)]
 #![feature(gen_future)]

Diff for: src/librustdoc/json/conversions.rs

@@ -412,7 +412,7 @@ impl FromWithTcx<clean::Type> for Type {
                         .map(|t| {
                             clean::GenericBound::TraitBound(t, rustc_hir::TraitBoundModifier::None)
                         })
-                        .chain(lt.into_iter().map(clean::GenericBound::Outlives))
+                        .chain(lt.map(clean::GenericBound::Outlives))
                         .map(|bound| bound.into_tcx(tcx))
                         .collect(),
                 }

Diff for: src/test/ui/generic-associated-types/issue-87258_a.rs

@@ -0,0 +1,24 @@
+#![feature(type_alias_impl_trait)]
+#![feature(generic_associated_types)]
+
+// See https://github.com/rust-lang/rust/issues/87258#issuecomment-883293367
+
+trait Trait1 {}
+
+struct Struct<'b>(&'b ());
+
+impl<'d> Trait1 for Struct<'d> {}
+
+pub trait Trait2 {
+    type FooFuture<'a>: Trait1;
+    fn foo<'a>() -> Self::FooFuture<'a>;
+}
+
+impl<'c, S: Trait2> Trait2 for &'c mut S {
+    type FooFuture<'a> = impl Trait1;
+    fn foo<'a>() -> Self::FooFuture<'a> { //~ ERROR
+        Struct(unimplemented!())
+    }
+}
+
+fn main() {}

Diff for: src/test/ui/generic-associated-types/issue-87258_a.stderr

@@ -0,0 +1,11 @@
+error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
+  --> $DIR/issue-87258_a.rs:19:21
+   |
+LL |     fn foo<'a>() -> Self::FooFuture<'a> {
+   |                     ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: hidden type `Struct<'_>` captures lifetime '_#7r
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0700`.

Diff for: src/test/ui/generic-associated-types/issue-87258_b.rs

@@ -0,0 +1,26 @@
+#![feature(type_alias_impl_trait)]
+#![feature(generic_associated_types)]
+
+// See https://github.com/rust-lang/rust/issues/87258#issuecomment-883293367
+
+trait Trait1 {}
+
+struct Struct<'b>(&'b ());
+
+impl<'d> Trait1 for Struct<'d> {}
+
+pub trait Trait2 {
+    type FooFuture<'a>: Trait1;
+    fn foo<'a>() -> Self::FooFuture<'a>;
+}
+
+type Helper<'xenon, 'yttrium, KABOOM: Trait2> = impl Trait1;
+
+impl<'c, S: Trait2> Trait2 for &'c mut S {
+    type FooFuture<'a> = Helper<'c, 'a, S>;
+    fn foo<'a>() -> Self::FooFuture<'a> { //~ ERROR
+        Struct(unimplemented!())
+    }
+}
+
+fn main() {}

Diff for: src/test/ui/generic-associated-types/issue-87258_b.stderr

@@ -0,0 +1,11 @@
+error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
+  --> $DIR/issue-87258_b.rs:21:21
+   |
+LL |     fn foo<'a>() -> Self::FooFuture<'a> {
+   |                     ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: hidden type `Struct<'_>` captures lifetime '_#7r
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0700`.

Diff for: src/test/ui/typeck/issue-90164.rs

@@ -0,0 +1,9 @@
+fn copy<R: Unpin, W>(_: R, _: W) {}
+
+fn f<T>(r: T) {
+    let w = ();
+    copy(r, w);
+    //~^ ERROR [E0277]
+}
+
+fn main() {}

Diff for: src/test/ui/typeck/issue-90164.stderr

@@ -0,0 +1,22 @@
+error[E0277]: `T` cannot be unpinned
+  --> $DIR/issue-90164.rs:5:10
+   |
+LL |     copy(r, w);
+   |     ---- ^ the trait `Unpin` is not implemented for `T`
+   |     |
+   |     required by a bound introduced by this call
+   |
+   = note: consider using `Box::pin`
+note: required by a bound in `copy`
+  --> $DIR/issue-90164.rs:1:12
+   |
+LL | fn copy<R: Unpin, W>(_: R, _: W) {}
+   |            ^^^^^ required by this bound in `copy`
+help: consider restricting type parameter `T`
+   |
+LL | fn f<T: std::marker::Unpin>(r: T) {
+   |       ++++++++++++++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.