diff options
Diffstat (limited to 'tests')
4 files changed, 39 insertions, 14 deletions
diff --git a/tests/ui/traits/object/elaborated-predicates-unconstrained-late-bound.rs b/tests/ui/traits/object/elaborated-predicates-unconstrained-late-bound.rs new file mode 100644 index 00000000000..b174776c596 --- /dev/null +++ b/tests/ui/traits/object/elaborated-predicates-unconstrained-late-bound.rs @@ -0,0 +1,24 @@ +// Make sure that when elaborating the principal of a dyn trait for projection predicates +// we don't end up in a situation where we have an unconstrained late-bound lifetime in +// the output of a projection. + +// Fix for <https://github.com/rust-lang/rust/issues/130347>. + +trait A<T>: B<T = T> {} + +trait B { + type T; +} + +struct Erase<T: ?Sized + B>(T::T); + +fn main() { + let x = { + let x = String::from("hello"); + + Erase::<dyn for<'a> A<&'a _>>(x.as_str()) + //~^ ERROR binding for associated type `T` references lifetime `'a`, which does not appear in the trait input types + }; + + dbg!(x.0); +} diff --git a/tests/ui/traits/object/elaborated-predicates-unconstrained-late-bound.stderr b/tests/ui/traits/object/elaborated-predicates-unconstrained-late-bound.stderr new file mode 100644 index 00000000000..067eaf5e7f3 --- /dev/null +++ b/tests/ui/traits/object/elaborated-predicates-unconstrained-late-bound.stderr @@ -0,0 +1,12 @@ +error[E0582]: binding for associated type `T` references lifetime `'a`, which does not appear in the trait input types + --> $DIR/elaborated-predicates-unconstrained-late-bound.rs:19:21 + | +LL | trait A<T>: B<T = T> {} + | ----- due to this supertrait +... +LL | Erase::<dyn for<'a> A<&'a _>>(x.as_str()) + | ^^^^^^^^^^^^^^^^ + +error: aborting due to 1 previous error + +For more information about this error, try `rustc --explain E0582`. diff --git a/tests/ui/traits/object/pretty.rs b/tests/ui/traits/object/pretty.rs index 6660ff040f7..603d7af5260 100644 --- a/tests/ui/traits/object/pretty.rs +++ b/tests/ui/traits/object/pretty.rs @@ -13,7 +13,7 @@ trait SuperGeneric<'a> { } trait AnyGeneric<'a>: SuperGeneric<'a> {} trait FixedGeneric1<'a>: SuperGeneric<'a, Assoc2 = &'a u8> {} -trait FixedGeneric2<'a>: Super<Assoc = &'a u8> {} +// trait FixedGeneric2<'a>: Super<Assoc = &'a u8> {} // Unsound! trait FixedHrtb: for<'a> SuperGeneric<'a, Assoc2 = &'a u8> {} trait AnyDifferentBinders: for<'a> SuperGeneric<'a, Assoc2 = &'a u8> + Super {} trait FixedDifferentBinders: for<'a> SuperGeneric<'a, Assoc2 = &'a u8> + Super<Assoc = u8> {} @@ -32,7 +32,7 @@ fn dyn_fixed_static(x: &dyn FixedStatic) { x } //~ERROR mismatched types fn dyn_super_generic(x: &dyn for<'a> SuperGeneric<'a, Assoc2 = &'a u8>) { x } //~ERROR mismatched types fn dyn_any_generic(x: &dyn for<'a> AnyGeneric<'a, Assoc2 = &'a u8>) { x } //~ERROR mismatched types fn dyn_fixed_generic1(x: &dyn for<'a> FixedGeneric1<'a>) { x } //~ERROR mismatched types -fn dyn_fixed_generic2(x: &dyn for<'a> FixedGeneric2<'a>) { x } //~ERROR mismatched types +// fn dyn_fixed_generic2(x: &dyn for<'a> FixedGeneric2<'a>) { x } // Unsound! fn dyn_fixed_generic_multi(x: &dyn for<'a> FixedGeneric1<'a, Assoc2 = &u8>) { x } //~ERROR mismatched types fn dyn_fixed_hrtb(x: &dyn FixedHrtb) { x } //~ERROR mismatched types fn dyn_any_different_binders(x: &dyn AnyDifferentBinders<Assoc = u8>) { x } //~ERROR mismatched types diff --git a/tests/ui/traits/object/pretty.stderr b/tests/ui/traits/object/pretty.stderr index ca56bdbb67a..af941e69c5f 100644 --- a/tests/ui/traits/object/pretty.stderr +++ b/tests/ui/traits/object/pretty.stderr @@ -107,17 +107,6 @@ LL | fn dyn_fixed_generic1(x: &dyn for<'a> FixedGeneric1<'a>) { x } found reference `&dyn for<'a> FixedGeneric1<'a>` error[E0308]: mismatched types - --> $DIR/pretty.rs:35:60 - | -LL | fn dyn_fixed_generic2(x: &dyn for<'a> FixedGeneric2<'a>) { x } - | - ^ expected `()`, found `&dyn FixedGeneric2<'a>` - | | - | help: try adding a return type: `-> &dyn for<'a> FixedGeneric2<'a>` - | - = note: expected unit type `()` - found reference `&dyn for<'a> FixedGeneric2<'a>` - -error[E0308]: mismatched types --> $DIR/pretty.rs:36:79 | LL | fn dyn_fixed_generic_multi(x: &dyn for<'a> FixedGeneric1<'a, Assoc2 = &u8>) { x } @@ -172,6 +161,6 @@ LL | fn dyn_has_gat(x: &dyn HasGat<u8, Assoc<bool> = ()>) { x } = note: expected unit type `()` found reference `&dyn HasGat<u8, Assoc<bool> = ()>` -error: aborting due to 15 previous errors; 1 warning emitted +error: aborting due to 14 previous errors; 1 warning emitted For more information about this error, try `rustc --explain E0308`. |