Test u32_T_where_T_Is_impls

Source location: tests/coherence_overlap.rs:292

#[test]
fn u32_T_where_T_Is_impls() {
    FormalityTest::new(crates![crate core {
        trait Foo {}
        impl Foo for u32 {}
        impl<T> Foo for T where T: Is {}

        trait Is {}
        impl Is for u32 {}
    }])
    .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: ! Is(!ty_0), via: Is(!ty_0), assumptions: {u32 = !ty_0, Is(!ty_0)}, env: Env { variables: [!ty_0], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:8:1: no applicable rules for prove_via { goal: ! Is(!ty_0), via: u32 = !ty_0, assumptions: {u32 = !ty_0, Is(!ty_0)}, env: Env { variables: [!ty_0], 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 {u32 = !ty_1, Is(!ty_1)} given {}, got [Constraints { env: Env { variables: [!ty_1], 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 Foo for u32 { }
            impl_b = impl <ty> Foo for ^ty0_0 where ^ty0_0 : Is { }"#]])
}

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