Test is_local_with_unconstrained_self_ty_blanket_impl

Source location: tests/coherence_overlap.rs:484

#[test]
fn is_local_with_unconstrained_self_ty_blanket_impl() {
    // TODO: this test should pass imho
    FormalityTest::new(crates![crate core {
                trait Project {
                    type Assoc: [];
                }

                impl<T> Project for T {
                    type Assoc = ();
                }

                trait Foo<U> { }
            },
            crate foo {
                struct LocalType {}
                impl Foo<LocalType> for () {}

                trait Overlap<U> {}
                impl<T, U> Overlap<U> for T
                where
                    <T as Project>::Assoc: Foo<U> {}
                impl<T> Overlap<LocalType> for T {}
            }]).err(expect_test::expect![[r#"
                the rule "different trait" at (coherence.rs) failed because
                  condition evaluated to false: `impl_a.trait_id() != impl_b.trait_id()`

                crates/formality-rust/src/prove/prove_via.rs:8:1: no applicable rules for prove_via { goal: ! Foo(<!ty_0 as Project>::Assoc, !ty_2), via: !ty_0 = !ty_1, assumptions: {!ty_0 = !ty_1, !ty_2 = LocalType, Foo(<!ty_0 as Project>::Assoc, !ty_2)}, env: Env { variables: [!ty_0, !ty_2, !ty_1], bias: Soundness, pending: [], allow_pending_outlives: false } }

                crates/formality-rust/src/prove/prove_via.rs:8:1: no applicable rules for prove_via { goal: ! Foo(<!ty_0 as Project>::Assoc, !ty_2), via: !ty_2 = LocalType, assumptions: {!ty_0 = !ty_1, !ty_2 = LocalType, Foo(<!ty_0 as Project>::Assoc, !ty_2)}, env: Env { variables: [!ty_0, !ty_2, !ty_1], bias: Soundness, pending: [], allow_pending_outlives: false } }

                crates/formality-rust/src/prove/prove_via.rs:8:1: no applicable rules for prove_via { goal: ! Foo(<!ty_0 as Project>::Assoc, !ty_2), via: Foo(<!ty_0 as Project>::Assoc, !ty_2), assumptions: {!ty_0 = !ty_1, !ty_2 = LocalType, Foo(<!ty_0 as Project>::Assoc, !ty_2)}, env: Env { variables: [!ty_0, !ty_2, !ty_1], bias: Soundness, pending: [], allow_pending_outlives: false } }

                the rule "negative impl" at (prove_wc.rs) failed because
                  expression evaluated to an empty collection: `decls.neg_impl_decls(&trait_ref.trait_id)`

                the rule "not goal" at (coherence.rs) failed because
                  failed to prove {!ty_1 = !ty_3, !ty_2 = LocalType, Foo(<!ty_1 as Project>::Assoc, !ty_2)} given {}, got [Constraints { env: Env { variables: [!ty_1, !ty_2, !ty_3], bias: Soundness, pending: [], allow_pending_outlives: false }, known_true: false, substitution: {} }]

                the rule "same impl" at (coherence.rs) failed because
                  condition evaluated to false: `impl_a == impl_b`
                    impl_a = impl <ty, ty> Overlap <^ty0_1> for ^ty0_0 where <^ty0_0 as Project>::Assoc : Foo <^ty0_1> { }
                    impl_b = impl <ty> Overlap <LocalType> for ^ty0_0 { }"#]])
}

Rules proved (0)

This test records no positive coverage.

Premises failed (10)

The last column links to the premise’s page when the judgment view counts this failure against that premise. It does not when the premise is read as infallible, or when the failure was blamed inside a multi-line premise that carries no record on its own first line.

Proof trees