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#![warn(clippy::implied_bounds_in_impls)]
#![allow(dead_code)]
use std::ops::{Deref, DerefMut};
// Only one bound, nothing to lint.
fn normal_deref<T>(x: T) -> impl Deref<Target = T> {
Box::new(x)
}
// Deref implied by DerefMut
fn deref_derefmut<T>(x: T) -> impl DerefMut<Target = T> {
Box::new(x)
}
trait GenericTrait<T> {}
trait GenericTrait2<V> {}
// U is intentionally at a different "index" in GenericSubtrait than `T` is in GenericTrait,
// so this can be a good test to make sure that the calculations are right (no off-by-one errors,
// ...)
trait GenericSubtrait<T, U, V>: GenericTrait<U> + GenericTrait2<V> {}
impl GenericTrait<i32> for () {}
impl GenericTrait<i64> for () {}
impl<V> GenericTrait2<V> for () {}
impl<V> GenericSubtrait<(), i32, V> for () {}
impl<V> GenericSubtrait<(), i64, V> for () {}
fn generics_implied<U, W>() -> impl GenericSubtrait<U, W, U>
where
(): GenericSubtrait<U, W, U>,
{
}
fn generics_implied_multi<V>() -> impl GenericSubtrait<(), i32, V> {}
fn generics_implied_multi2<T, V>() -> impl GenericSubtrait<(), T, V>
where
(): GenericSubtrait<(), T, V> + GenericTrait<T>,
{
}
// i32 != i64, GenericSubtrait<_, i64, _> does not imply GenericTrait<i32>, don't lint
fn generics_different() -> impl GenericTrait<i32> + GenericSubtrait<(), i64, ()> {}
// i32 == i32, GenericSubtrait<_, i32, _> does imply GenericTrait<i32>, lint
fn generics_same() -> impl GenericSubtrait<(), i32, ()> {}
trait SomeTrait {
// Check that it works in trait declarations.
fn f() -> impl DerefMut<Target = u8>;
}
struct SomeStruct;
impl SomeStruct {
// Check that it works in inherent impl blocks.
fn f() -> impl DerefMut<Target = u8> {
Box::new(123)
}
}
impl SomeTrait for SomeStruct {
// Check that it works in trait impls.
fn f() -> impl DerefMut<Target = u8> {
Box::new(42)
}
}
mod issue11422 {
use core::fmt::Debug;
// Some additional tests that would cause ICEs:
// `PartialOrd` has a default generic parameter and does not need to be explicitly specified.
// This needs special handling.
fn default_generic_param1() -> impl PartialOrd + Debug {}
fn default_generic_param2() -> impl PartialOrd + Debug {}
// Referring to `Self` in the supertrait clause needs special handling.
trait Trait1<X: ?Sized> {}
trait Trait2: Trait1<Self> {}
impl Trait1<()> for () {}
impl Trait2 for () {}
fn f() -> impl Trait1<()> + Trait2 {}
}
mod issue11435 {
// Associated type needs to be included on DoubleEndedIterator in the suggestion
fn my_iter() -> impl DoubleEndedIterator<Item = u32> {
0..5
}
// Removing the `Clone` bound should include the `+` behind it in its remove suggestion
fn f() -> impl Copy {
1
}
trait Trait1<T> {
type U;
}
impl Trait1<i32> for () {
type U = i64;
}
trait Trait2<T>: Trait1<T> {}
impl Trait2<i32> for () {}
// When the other trait has generics, it shouldn't add another pair of `<>`
fn f2() -> impl Trait2<i32, U = i64> {}
trait Trait3<T, U, V> {
type X;
type Y;
}
trait Trait4<T>: Trait3<T, i16, i64> {}
impl Trait3<i8, i16, i64> for () {
type X = i32;
type Y = i128;
}
impl Trait4<i8> for () {}
// Associated type `X` is specified, but `Y` is not, so only that associated type should be moved
// over
fn f3() -> impl Trait4<i8, X = i32, Y = i128> {}
}
fn main() {}
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