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Auto merge of rust-lang#90887 - jackh726:issue-90729, r=nikomatsakis
Try to normalize associated types before processing obligations Closes rust-lang#90729 r? `@nikomatsakis`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| // check-pass | ||
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| #![feature(generic_associated_types)] | ||
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| use std::marker::PhantomData; | ||
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| pub trait Type { | ||
| type Ref<'a>; | ||
| } | ||
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| pub trait AsBytes {} | ||
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| impl AsBytes for &str {} | ||
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| pub struct Utf8; | ||
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| impl Type for Utf8 { | ||
| type Ref<'a> = &'a str; | ||
| } | ||
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| pub struct Bytes<T: Type> { | ||
| _marker: PhantomData<T>, | ||
| } | ||
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| impl<T: Type> Bytes<T> | ||
| where | ||
| for<'a> T::Ref<'a>: AsBytes, | ||
| { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| _marker: PhantomData, | ||
| } | ||
| } | ||
| } | ||
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| fn main() { | ||
| let _b = Bytes::<Utf8>::new(); | ||
| } |
10 changes: 10 additions & 0 deletions
10
src/test/ui/generic-associated-types/issue-91139.migrate.stderr
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| error[E0311]: the parameter type `T` may not live long enough | ||
| --> $DIR/issue-91139.rs:27:12 | ||
| | | ||
| LL | fn foo<T>() { | ||
| | - help: consider adding an explicit lifetime bound...: `T: 'a` | ||
| LL | let _: for<'a> fn(<() as Foo<T>>::Type<'a>, &'a T) = |_, _| (); | ||
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds | ||
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| error: aborting due to previous error | ||
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|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // check-pass | ||
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| #![feature(generic_associated_types)] | ||
| use std::marker::PhantomData; | ||
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| pub struct Id<'id>(PhantomData<fn(&'id ()) -> &'id ()>); | ||
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| fn new_id() -> Id<'static> { | ||
| Id(PhantomData) | ||
| } | ||
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| pub trait HasLifetime where { | ||
| type AtLifetime<'a>; | ||
| } | ||
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| pub struct ExistentialLifetime<S: HasLifetime>(S::AtLifetime<'static>); | ||
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| impl<S: HasLifetime> ExistentialLifetime<S> { | ||
| pub fn new<F>(f: F) -> ExistentialLifetime<S> | ||
| where for<'id> F: FnOnce(Id<'id>) -> S::AtLifetime<'id> { | ||
| ExistentialLifetime(f(new_id())) | ||
| } | ||
| } | ||
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| struct ExampleS<'id>(Id<'id>); | ||
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| struct ExampleMarker; | ||
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| impl HasLifetime for ExampleMarker { | ||
| type AtLifetime<'id> = ExampleS<'id>; | ||
| } | ||
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| fn broken0() -> ExistentialLifetime<ExampleMarker> { | ||
| fn new_helper<'id>(id: Id<'id>) -> ExampleS<'id> { | ||
| ExampleS(id) | ||
| } | ||
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| ExistentialLifetime::<ExampleMarker>::new(new_helper) | ||
| } | ||
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| fn broken1() -> ExistentialLifetime<ExampleMarker> { | ||
| fn new_helper<'id>(id: Id<'id>) -> <ExampleMarker as HasLifetime>::AtLifetime<'id> { | ||
| ExampleS(id) | ||
| } | ||
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| ExistentialLifetime::<ExampleMarker>::new(new_helper) | ||
| } | ||
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| fn broken2() -> ExistentialLifetime<ExampleMarker> { | ||
| ExistentialLifetime::<ExampleMarker>::new(|id| ExampleS(id)) | ||
| } | ||
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| fn main() {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| // check-pass | ||
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| #![feature(generic_associated_types)] | ||
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| use std::marker::PhantomData; | ||
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| pub trait Scalar: 'static { | ||
| type RefType<'a>: ScalarRef<'a>; | ||
| } | ||
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| pub trait ScalarRef<'a>: 'a {} | ||
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| impl Scalar for i32 { | ||
| type RefType<'a> = i32; | ||
| } | ||
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| impl Scalar for String { | ||
| type RefType<'a> = &'a str; | ||
| } | ||
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| impl Scalar for bool { | ||
| type RefType<'a> = i32; | ||
| } | ||
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| impl<'a> ScalarRef<'a> for bool {} | ||
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| impl<'a> ScalarRef<'a> for i32 {} | ||
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| impl<'a> ScalarRef<'a> for &'a str {} | ||
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| fn str_contains(a: &str, b: &str) -> bool { | ||
| a.contains(b) | ||
| } | ||
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| pub struct BinaryExpression<A: Scalar, B: Scalar, O: Scalar, F> | ||
| where | ||
| F: Fn(A::RefType<'_>, B::RefType<'_>) -> O, | ||
| { | ||
| f: F, | ||
| _phantom: PhantomData<(A, B, O)>, | ||
| } | ||
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| impl<A: Scalar, B: Scalar, O: Scalar, F> BinaryExpression<A, B, O, F> | ||
| where | ||
| F: Fn(A::RefType<'_>, B::RefType<'_>) -> O, | ||
| { | ||
| pub fn new(f: F) -> Self { | ||
| Self { | ||
| f, | ||
| _phantom: PhantomData, | ||
| } | ||
| } | ||
| } | ||
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| fn main() { | ||
| BinaryExpression::<String, String, bool, _>::new(str_contains); | ||
| } |
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