Test T_where_Bar_and_ref_T

Source location: tests/coherence_overlap.rs:394

#[test]
fn T_where_Bar_and_ref_T() {
    FormalityTest::new(crates![crate core {
        trait Foo {}
        trait Bar {}
        impl<T> Foo for T where T: Bar {}
        impl<T> Foo for &'static T {}
    }])
    .rustc_err(expect_test::expect![[r#"
        error[E0119]: conflicting implementations of trait `Foo` for type `&'static _`
         --> lib.rs
          |
        5 | impl<T00> Foo for T00 where T00: Bar {}
          | ------------------------------------ first implementation here
        6 |
        7 | impl<T00> Foo for &'static T00 {}
          | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `&'static _`
          |
          = note: downstream crates may implement trait `Bar` for type `&'static _`

        For more information about this error, try `rustc --explain E0119`.
        error: could not compile `mycore` (lib) due to 1 previous error
    "#]])
    .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:9:1: no applicable rules for prove_via { goal: ! Bar(!ty_0), via: !ty_0 = &' static !ty_1, assumptions: {!ty_0 = &' static !ty_1, Bar(!ty_0)}, env: Env { variables: [!ty_0, !ty_1], bias: Soundness, pending: [], allow_pending_outlives: false } }

        crates/formality-rust/src/prove/prove_via.rs:9:1: no applicable rules for prove_via { goal: ! Bar(!ty_0), via: Bar(!ty_0), assumptions: {!ty_0 = &' static !ty_1, Bar(!ty_0)}, env: Env { variables: [!ty_0, !ty_1], bias: Soundness, pending: [], allow_pending_outlives: false } }

        the rule "negative impl" at (prove_predicate.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 = &' static !ty_2, Bar(!ty_1)} given {}, got [Constraints { env: Env { variables: [!ty_1, !ty_2], 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> Foo for ^ty0_0 where ^ty0_0 : Bar { }
            impl_b = impl <ty> Foo for &' static ^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

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